ConocoPhillips (COP) 10-K 16 Feb 21 2020 FY Annual report Financial data

Cover Page

Cover Page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2020	Jan. 31, 2021	Jun. 30, 2020
Document And Entity Information [Abstract]
Entity Central Index Key	0001163165
Amendment Flag	false
Entity File Number	001-32395
Entity Registrant Name	ConocoPhillips
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Entity Incorporation State or Country Code	DE
Entity Tax Identification Number	01-0562944
Entity Address, Address Line One	925 N. Eldridge Parkway
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77079
City Area Code	281
Local Phone Number	293-1000
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Icfr Auditor Attestation Flag	true
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 45.1
Entity Common Stock, Shares Outstanding		1,354,734,727
Entity Listings [Line Items]
Documents Incorporated By Reference [Text Block]	Documents incorporated by reference: Portions of the Proxy Statement for the Annual Meeting of Stockholders to be held on May 11, 2021 (Part III)
Common Stock, $.01 Par Value [Member]
Entity Listings [Line Items]
Title of 12(b) Security	Common Stock, $.01 Par Value
Trading Symbol	COP
Security Exchange Name	NYSE
Seven Percent Debentures Due Twenty Twenty-nine [Member]
Entity Listings [Line Items]
Title of 12(b) Security	7% Debentures due 2029
Trading Symbol	CUSIP—718507BK1
Security Exchange Name	NYSE

Consolidated Income Statement

Consolidated Income Statement - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues and Other Income
Sales and other operating revenues	$ 18,784,000,000	$ 32,567,000,000	$ 36,417,000,000
Equity in earnings of affiliates	432,000,000	779,000,000	1,074,000,000
Gain on dispositions	549,000,000	1,966,000,000	1,063,000,000
Other income (loss)	(509,000,000)	1,358,000,000	173,000,000
Total Revenues and Other Income	19,256,000,000	36,670,000,000	38,727,000,000
Cost and expenses [Abstract]
Purchased commodities	8,078,000,000	11,842,000,000	14,294,000,000
Production and operating expenses	4,344,000,000	5,322,000,000	5,213,000,000
Selling, general and administrative expenses	430,000,000	556,000,000	401,000,000
Exploration expenses	1,457,000,000	743,000,000	369,000,000
Depreciation, depletion and amortization	5,521,000,000	6,090,000,000	5,956,000,000
Impairments	813,000,000	405,000,000	27,000,000
Taxes other than income taxes	754,000,000	953,000,000	1,048,000,000
Accretion on discounted liabilities	252,000,000	326,000,000	353,000,000
Interest and debt expense	806,000,000	778,000,000	735,000,000
Foreign currency transaction (gains) losses	(72,000,000)	66,000,000	(17,000,000)
Other expenses	13,000,000	65,000,000	375,000,000
Total Costs and Expenses	22,396,000,000	27,146,000,000	28,754,000,000
Income (loss) before income taxes	(3,140,000,000)	9,524,000,000	9,973,000,000
Income tax provision (benefit)	(485,000,000)	2,267,000,000	3,668,000,000
Net income (loss)	(2,655,000,000)	7,257,000,000	6,305,000,000
Less: net income attributable to noncontrolling interests	(46,000,000)	(68,000,000)	(48,000,000)
Net income (loss) attributable to ConocoPhillips	$ (2,701,000,000)	$ 7,189,000,000	$ 6,257,000,000
Net Income (Loss) Attributable to ConocoPhillips Per Share of Common Stock (dollars)
Earnings Per Share, Basic	$ (2.51)	$ 6.43	$ 5.36
Earnings per Share, Diluted	$ (2.51)	$ 6.40	$ 5.32
Average Common Shares Outstanding (in thousands)
Basic	1,078,030	1,117,260	1,166,499
Diluted	1,078,030	1,123,536	1,175,538

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Consolidated Statement of Comprehensive Income
Net income (loss)		$ (2,655)	$ 7,257	$ 6,305
Defined benefit plans
Prior service (cost) credit arising during the period		29	0	(7)
Reclassification adjustment for amortization of prior service credit included in net income (loss)		(32)	(35)	(40)
Net change during the period		(3)	(35)	(47)
Net actuarial loss arising during the period		(210)	(55)	(150)
Reclassification adjustment for amortization of prior service credit included in net income (loss)		117	146	279
Net change		(93)	91	129
Nonsponsored plans	[1]	1	(3)	(1)
Income taxes on defined benefit plans		20	(2)	(42)
Defined benefit plans, net of tax		(75)	51	39
Unrealized holding gain on securities		2	0	0
Unrealized gain on securities, net of tax		2	0	0
Foreign currency translation adjustments		209	699	(645)
Income taxes on foreign currency translation adjustments		3	(4)	3
Foreign currency translation adjustments, net of tax		212	695	(642)
Other comprehensive income (loss), net of tax		139	746	(603)
Comprehensive income (loss)		(2,516)	8,003	5,702
Less: comprehensive income attributable to noncontrolling interests		(46)	(68)	(48)
Comprehensive Income (Loss) Attributable to ConocoPhillips		$ (2,562)	$ 7,935	$ 5,654
[1]	<div>Plans for which ConocoPhillips is not the primary obligor—primarily those administered by equity affiliates.</div>

Consolidated Balance Sheet

Consolidated Balance Sheet - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Assets
Cash and cash equivalents	$ 2,991,000,000	$ 5,088,000,000
Short-term Investments	3,609,000,000	3,028,000,000
Accounts and notes receivable (net of allowance of $4 and $13, respectively)	2,634,000,000	3,267,000,000
Accounts and notes receivable-related parties	120,000,000	134,000,000
Investment in Cenovus Energy	1,256,000,000	2,111,000,000
Inventories	1,002,000,000	1,026,000,000
Prepaid expenses and other current assets	454,000,000	2,259,000,000
Total Current Assets	12,066,000,000	16,913,000,000
Investments and long-term receivables	8,017,000,000	8,687,000,000
Loans and advances-related parties	114,000,000	219,000,000
Net properties, plants and equipment (net of accumulated DD&A of $62,213 and $55,477, respectively)	39,893,000,000	42,269,000,000
Other assets	2,528,000,000	2,426,000,000
Total Assets	62,618,000,000	70,514,000,000
Liabilities
Accounts payable	2,669,000,000	3,176,000,000
Accounts payable-related parties	29,000,000	24,000,000
Short-term debt	619,000,000	105,000,000
Accrued income and other taxes	320,000,000	1,030,000,000
Employee benefit obligations	608,000,000	663,000,000
Other accruals	1,121,000,000	2,045,000,000
Total Current Liabilities	5,366,000,000	7,043,000,000
Long-term debt	14,750,000,000	14,790,000,000
Long-term asset retirement obligations and accrued environmental costs	5,430,000,000	5,352,000,000
Deferred taxes Included in long-term liabilities	3,747,000,000	4,634,000,000
Employee benefit obligations	1,697,000,000	1,781,000,000
Other liabilities and deferred credits	1,779,000,000	1,864,000,000
Total Liabilities	32,769,000,000	35,464,000,000
Equity
Common stock (2,500,000,000 shares authorized at $0.01 par value) Issued (2020 - 1,798,844,267 shares; 2019 - 1,795,652,203 shares)	18,000,000	18,000,000
Capital in excess of par	47,133,000,000	46,983,000,000
Treasury stock (at cost: 2020 - 730,802,089 shares; 2019 - 710,783,814 shares)	(47,297,000,000)	(46,405,000,000)
Accumulated other comprehensive income (loss)	(5,218,000,000)	(5,357,000,000)
Retained earnings	35,213,000,000	39,742,000,000
Total Common Stockholders' Equity	29,849,000,000	34,981,000,000
Noncontrolling interests	0	69,000,000
Total Equity	29,849,000,000	35,050,000,000
Total Liabilities and Equity	$ 62,618,000,000	$ 70,514,000,000

Consolidated Balance Sheet (Par

Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Consolidated Balance Sheet [Abstract]
Allowance for accounts and notes receivable	$ 4	$ 13
Accumulated depreciation, depletion and amortization	$ 62,213	$ 55,477
Common stock, shares authorized	2,500,000,000	2,500,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares issued	1,798,844,267	1,795,652,203
Treasury stock, shares	730,802,089	710,783,814

Consolidated Statement of Cash

Consolidated Statement of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Cash Flows From Operating Activities
Net income (loss)		$ (2,655)		$ 7,257		$ 6,305
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation, depletion and amortization		5,521		6,090		5,956
Impairments		813		405		27
Dry hole costs and leasehold impairments related to exploration only		1,083		421		95
Accretion on discounted liabilities		252		326		353
Deferred taxes		(834)		(444)		283
Undistributed equity earnings		645		594		152
Gain on dispositions		(549)		(1,966)		(1,063)
Unrealized (gain) loss on investment in Cenovus Energy		855		(649)		437
Other		43		(351)		(246)
Working capital adjustments
Decrease in accounts and notes receivable		521		505		235
Decrease (increase) in inventories		(25)		(67)		86
Decrease (increase) in prepaid expenses and other current assets		76		37		(55)
Decrease in accounts payable		(249)		(378)		(52)
Increase (decrease) in taxes and other accruals		(695)		(676)		421
Net Cash Provided by Operating Activities		4,802		11,104		12,934
Cash Flows From Investing Activities
Capital expenditures and investments		(4,715)		(6,636)		(6,750)
Working capital charges associated with investing activities		(155)		(103)		(68)
Proceeds from asset dispositions		1,317		3,012		1,082
Net Sales (Purchases) of Investments		(658)		(2,910)		1,620
Collections of advances/loans - related parties		116		127		119
Other		(26)		(108)		154
Net Cash Used in Investing Activities		(4,121)		(6,618)		(3,843)
Cash Flows From Financing Activities
Issuance of debt		300		0		0
Repayment of debt		(254)		(80)		(4,995)
Issuance of company common stock		(5)		(30)		121
Repurchase of company common stock		(892)		(3,500)		(2,999)
Dividends paid		(1,831)		(1,500)		(1,363)
Other		(26)		(119)		(123)
Net Cash Provided by (Used in) Financing Activities		(2,708)		(5,229)		(9,359)
Effect of Exchange Rate Changes on Cash and Cash Equivalents and Restricted Cash		(20)		(46)		(117)
Net Change in Cash and Cash Equivalents and Restricted Cash Increase (Decrease)		(2,047)		(789)		(385)
Cash and Cash Equivalents and Restricted Cash at beginning of period		5,362	[1]	6,151	[1]	6,536
Cash and Cash Equivalents and Restricted Cash at end of period	[1]	$ 3,315		$ 5,362		$ 6,151
[1]	See Notes to Consolidated Financial Statements.

Consolidated Statement of Cas_2

Consolidated Statement of Cash Flows (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Other Assets [Member]
Restricted Cash	$ 230	$ 184
Prepaid Expenses and Other Current Assets [Member]
Restricted Cash	$ 94	$ 90

Consolidated Statement of Chang

Consolidated Statement of Changes in Equity - USD ($) $ in Millions		Total	Common Stock [Member]	Capital in excess of par	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2017		$ 30,801	$ 18	$ 46,622	$ (39,906)	$ (5,518)	$ 29,391	$ 194
Net income (loss)		6,305					6,257	48
Other comprehensive income (loss)		(603)				(603)
Dividends paid		(1,363)					(1,363)
Treasury Stock Value Acquired Cost Method		(2,999)			(2,999)
Distributions to noncontrolling interests and other		(121)						(121)
Distributed under benefit plans		257		257
Other		7					3	4
Ending Balance at Dec. 31, 2018		32,064	18	46,879	(42,905)	(6,063)	34,010	125
Changes in Accounting Principles	[1]	(220)				58	(278)
Net income (loss)		7,257					7,189	68
Other comprehensive income (loss)		746				746
Dividends paid		(1,500)					(1,500)
Treasury Stock Value Acquired Cost Method		(3,500)			(3,500)
Distributions to noncontrolling interests and other		(128)						(128)
Distributed under benefit plans		104		104
Other		7					3	4
Ending Balance at Dec. 31, 2019		35,050	18	46,983	(46,405)	(5,357)	39,742	69
Changes in Accounting Principles	[2]	0				(40)	40
Net income (loss)		(2,655)					(2,701)	46
Other comprehensive income (loss)		139				139
Dividends paid		(1,831)					(1,831)
Treasury Stock Value Acquired Cost Method		(892)			(892)
Distributions to noncontrolling interests and other		(32)						(32)
Disposition		(84)						(84)
Distributed under benefit plans		150		150
Other		4					3	1
Ending Balance at Dec. 31, 2020		$ 29,849	$ 18	$ 47,133	$ (47,297)	$ (5,218)	$ 35,213	$ 0
[1]	<div>*Cumulative effect of the adoption of ASC Topic 606, "Revenue from Contracts with Customers," and ASU No. 2016-01, "Recognition and Measurement of Financial Assets and Liabilities," at January 1, 2018.</div>
[2]	<div>**Cumulative effect of the adoption of ASU No. 2018-02, "Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income." See Notes to Consolidated Financial Statements.</div>

Consolidated Statement of Cha_2

Consolidated Statement of Changes in Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]
Common Stock, Dividends, Per Share, Cash Paid	$ 1.69	$ 1.34	$ 1.16

Accounting Policies

Accounting Policies	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Accounting Policies	Note 1—Accounting Policies ■ Consolidation Principles and Investments —Our consolidated financial statements of majority-owned, controlled subsidiaries beneficiary. ability to exert significant influence over the affiliates’ have the ability to exert significant influence, investment does not have a readily determinable cost minus impairment, plus or minus observable similar investment of the same issuer. gas plants and terminals are consolidated on a proportionate generally carried at cost. We manage our operations through six operating segments, defined by geographic 48; Canada; information, see Note 24—Segment Disclosures The unrealized (gain) loss on investment in Cenovus cash flows, previously reflected on the line item has been reclassified in the comparative periods ■ Foreign Currency Translation —Adjustments resulting from the process of translating functional currency financial statements into comprehensive loss in common stockholders’ equity. included in current earnings. currency. ■ Use of Estimates —The preparation of financial statements generally accepted in the U.S. requires management reported amounts of assets, liabilities, liabilities. ■ Revenue Recognition —Revenues associated with the sales of crude NGLs and other items are recognized at the point In evaluating when a customer has control of the title and physical delivery has occurred, whether ownership, and whether the customer has accepted are typically sold at prevailing market prices. deliveries (performance obligations) in the efforts to transfer control of current period deliveries to the expect to be entitled to in exchange for the related Payment is typically due within 30 days or less. Revenues associated with transactions commonly of inventory with the same counterparty are entered and reported net (i.e., on the same income statement ■ Shipping and Handling Costs —We typically incur shipping and handling costs prior to control transferring to the customer and account for these shipping and handling costs in production and operating Transportation costs related to marketing activities are recorded billed to customers are treated as a component of the revenue when the customer obtains control. ■ Cash Equivalents —Cash equivalents are highly liquid, convertible to known amounts of cash and have purchase. ■ Short-Term Investments —Short-term investments include investments marketable securities (commercial paper and government accrued interest and have original maturities remaining maturities are within one year. for sale debt securities which are carried at fair investments when they have remaining maturities ■ Long-Term Investments in Debt Securities —Long-term investments in debt securities financial instruments classified as available for sale one year as of the balance sheet date. and long-term receivables” line of our consolidated ■ Inventories —We have several valuation methods for our various types of inventories use the following methods for each type of inventory. are recorded at cost using the LIFO basis. the aggregate. permanent adjustments to the LIFO cost basis. current revenues. product to its existing condition and location, development costs. well equipment, are valued using various methods, FIFO method, consistent with industry practice. ■ Fair Value Measurements —Assets and liabilities measured at fair value within the fair value hierarchy are categorized into observability of the inputs employed in the measurement. markets for identical assets or liabilities. included within Level 1 for the asset or liability, either directly or indirectly inputs. to observable related market data or our assumptions ■ Derivative Instruments —Derivative instruments are recorded on the balance right of offset exists and certain other criteria are met, counterparty are netted on the balance sheet and the derivative assets and derivative liabilities, Recognition and classification of the gain or loss fair value depends on the purpose for issuing or not accounted for as hedges are recognized immediately on our derivative instruments. ■ Oil and Gas Exploration and Development —Oil and gas exploration and development accounted for using the successful efforts method of Property Acquisition Costs —Oil and gas leasehold acquisition costs are the balance sheet caption PP&E. experience and management’s judgment. to be classified as proved, the associated leasehold Exploratory Costs —Geological and geophysical costs and the undeveloped properties are expensed as incurred. “suspended,” on the balance sheet pending further reserves have been found. are expensed as dry holes. gas, the well costs remain capitalized on the balance reserves and the economic and operating viability exploratory discoveries, it is not unusual to sheet for several years while we perform additional potential oil and gas field or while we seek government or seek environmental permitting. projects are moved into the development phase, reserves. Management reviews suspended well balances quarterly, continuously monitors additional appraisal drilling and seismic work, when it judges the potential field does not Suspended Wells and Exploration Expenses, for additional information on suspended Development Costs —Costs incurred to drill and equip development development wells, are capitalized. Depletion and Amortization —Leasehold costs of producing properties of-production method based on estimated proved development costs is based on the unit-of-production and gas reserves. ■ Capitalized Interest —Interest from external borrowings is expected construction period of one year or longer. underlying asset and is amortized over the useful assets. ■ Depreciation and Amortization —Depreciation and amortization of PP&E properties and SAGD facilities and certain pipeline declining utilization pattern), are determined by amortization of all other PP&E are determined group-straight-line method (for those individual ■ Impairment of Properties, Plants and Equipment —PP&E used in operations are assessed for impairment whenever changes in facts and circumstances the future cash flows expected to be generated amount of an asset may not be recovered, a recoverability assumptions such as for prices, volumes and future undiscounted cash flows before income-taxes is carrying value is written down to estimated fair which the determination of the impairment purposes at the lowest level for which there are cash flows of other groups of assets—generally usually is a lack of quoted market prices for determined based on the present values of expected believed to be consistent with those used by principal operating cash flow validated with historical lived assets committed by management for disposal amortized cost or fair value, less cost to sell, if available, or present value of expected future The expected future cash flows used for impairment on estimated future production volumes, prices review. including any development expenditures necessary probable and possible reserves exist, an appropriate included in the impairment calculation. ■ Impairment of Investments in Nonconsolidated —Investments in nonconsolidated entities assessed for impairment whenever changes in the occurred. value of the investment is written down to fair on quoted market prices, if available, or upon discount rates and prices believed to be consistent market analysis of comparable assets owned by the ■ Maintenance and Repairs —Costs of maintenance and repairs, which are are expensed when incurred. ■ Property Dispositions —When complete units of depreciable property accumulated depreciation are eliminated, of our consolidated income statement. disposed of or retired which do not significantly and salvage value is charged or credited to accumulated ■ Asset Retirement Obligations and Environmental Costs —The fair value of legal obligations to retire and remove long-lived assets are recorded in when the asset is installed at the production location). approach, incorporating assumptions about estimated the use of technologies. carrying amount of the related PP&E. will record an adjustment to both the liability change in its present value, and the capitalized cost related asset. credit to impairment, if the asset had been previously not been previously impaired. Accrued Environmental Costs. Environmental expenditures are expensed or capitalized, Expenditures relating to an existing condition economic benefit, are expensed. undiscounted basis (unless acquired through a business basis) when environmental assessments or cleanups estimated. their receipt is probable and estimable. ■ Guarantees —The fair value of a guarantee is determined guarantee is given. the guarantee. the facts and circumstances surrounding each type indefinite, we reverse the liability when we have or amortize it over an appropriate time time. the guarantee. separate liability if it is reasonably estimable, reverse the fair value liability only when there ■ Share-Based Compensation —We recognize share-based compensation expense over the shorter of the service period (i.e., the stated period of time required start of the service period and ending when an elected to recognize expense on a straight-line the award was granted with ratable or cliff vesting. ■ Income Taxes —Deferred income taxes are computed using temporary differences between the financial reporting basis except for deferred taxes on income and temporary adjustment considered to be permanently reinvested joint ventures. taxes. related to unrecognized tax benefits are reflected ■ Taxes Collected from Customers and Remitted to Governmental Authorities —Sales and value- added taxes are recorded net. ■ Net Income (Loss) Per Share of Common Stock —Basic net income (loss) per share of common stock is calculated based upon the daily weighted-average year. calculation includes fully vested stock and unit common stock, along with an adjustment to unit awards that are considered participating includes unvested stock, unit or option awards granted unexercised stock options, but only to the extent these under the treasury-stock method. per share, does not assume conversion or exercise Treasury stock is excluded from the daily weighted-average number both calculations.

Change in Accounting Priniciple

Change in Accounting Priniciples	12 Months Ended
	Dec. 31, 2020
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Standards [Text Block]	Note 2—Changes in Accounting Principles We adopted the provisions of FASB ASU No. 2016-13, “Measurement of Credit Losses on Financial Instruments,” (ASC Topic 326) and its amendments, beginning January 1, 2020. This ASU, as amended, sets forth the current expected credit loss model, a new forward-looking impairment model for certain financial instruments measured at amortized cost basis based on expected losses rather than incurred losses. This ASU, as amended, which primarily applies to our accounts receivable, also requires credit losses related to available- for-sale debt securities to be recorded through an allowance for credit losses. The adoption of this ASU did not have a material impact to our financial statements. The majority of our receivables are due within 30 days or less. We monitor the credit quality of our counterparties through review of collections, credit ratings, and other analyses. We develop our estimated allowance for credit losses primarily using an aging method and analyses of historical loss rates as well as consideration of current and future conditions that could impact our counterparties’ credit quality and liquidity.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2020
Inventories [Abstract]
Inventories	Note 3—Inventories Inventories at December 31 were: Millions of Dollars 2020 2019 Crude oil and natural gas $ 461 472 Materials and supplies 541 554 $ 1,002 1,026 Inventories valued on the LIFO basis totaled 282 286 respectively. 228 our crude oil and natural gas inventories, which is consolidated income statement. replacement cost over LIFO cost of inventories 87 155 December 31, 2020 and 2019, respectively.

Assets Acquisitions and Disposi

Assets Acquisitions and Dispositions	12 Months Ended
	Dec. 31, 2020
Disposal Group Not Discontinued Operation Disposal Disclosures [Abstract]
Long Lived Assets Held For Sale [Text Block]	Note 4—Asset Acquisitions and Dispositions All gains or losses on asset dispositions dispositions” line on our consolidated income “Cash Flows From Investing Activities” section On January 15, 2021, we completed our acquisition and gas exploration and production company the Permian Basin. 13.1 1.46 shares of ConocoPhillips common stock resulting in the issuance of approximately 286 assumed $ 3.9 value of $ 4.7 25—Acquisition of Concho Resources Inc. 2020 Asset Acquisition In August 2020, we completed the acquisition Ltd. for $ 382 31 associated with partially owned infrastructure. and included 140,000 adjacent to our existing Montney position. approximately 295,000 100 asset acquisition resulting in the recognition of $ 490 77 environmental costs; and $ 31 operations for the Montney asset are reported in our Assets Sold In February 2020, we sold our Waddell Ranch interests in the Permian Basin for $ 184 adjustments. No interests sold were reported in our Lower 48 segment. In March 2020, we completed the sale of our 359 customary adjustments and recognized a before-tax 38 disposition, our interest in Niobrara had a net carrying 397 $ 433 34 Niobrara, including the loss on disposition noted above 386 signed an agreement to sell our interests in 25 372 the years ended December 31, 2020 and 2019, interests in Niobrara for the year ended December 35 Niobrara interests sold were reported in our In May 2020, we completed the divestiture operations, and based on an effective date of January 765 additional $ 200 recognized a before-tax gain of $ 587 net carrying value of the subsidiaries sold was approximately 0.2 0.5 net carrying value consisted primarily of $ 1.3 0.1 $ 0.7 0.3 0.2 earnings associated with the subsidiaries sold, 851 million, $ 372 364 Production from the beginning of the year through 43 Results of operations for the subsidiaries 2019 Assets Sold In January 2019, we entered into agreements to sell 12.4 LNG Terminal and Golden Pass Pipeline. obligations for retaining use of the facilities. before-tax impairment of $ 60 of affiliates” line on our consolidated income statement. Results of operations for these assets were reported Measurement for additional information. In April 2019, we entered into an agreement to sell Limited for $ 2.675 On September 30, 2019, we completed the sale for 2.2 1.7 before-tax and $ 2.1 sold indirectly held our exploration and production carrying value was approximately $ 0.5 1.6 0.5 cumulative foreign currency translation adjustments, 0.3 1.8 billion of ARO and negative $ 0.1 subsidiaries sold, including the gain on dispositions 2.1 0.9 years ended December 31, 2019 and 2018, respectively. within our Europe, Middle East and North Africa segment. In the second quarter of 2019, we recognized an 52 our 30 350 Greater Sunrise Fields were included in our Asia In the fourth quarter of 2019, we sold our interests 16 million and recognized a before-tax gain of $ 82 of $ 4 70 our Lower 48 segment. 2018 Assets Sold In the first quarter of 2018, we completed the sale of proceeds of $ 112 No completed the sale of a package of largely undeveloped acreage $ 105 no noncash exchange of undeveloped acreage in value resulting in the recognition of a $ 56 packages of undeveloped acreage in the Lower 162 recognized gains of approximately $ 140 On October 31, 2018, we completed the sale of 196 million after customary adjustments and recognized 5 million in 2018 to reduce the net carrying value interest in Barnett had a net carrying value of $ 201 250 49 million of AROs. impairment and loss on disposition noted above, 59 Barnett results of operations were included in our On December 18, 2018, we completed the sale of 16.5 24 7.5 interest in the field. 39.2 Kuparuk Area in Alaska, including their 38 Assets). 1,743 customary adjustments which resulted in net 253 Field had a net carrying value of approximately 1,028 1,553 PP&E, $ 485 59 $ 715 16.5 Clair Field, including the recognized gain, were $ 748 Field are reported within our Europe, Middle included in our Alaska segment. Acquisitions In May 2018, we completed the acquisition of 22 North Slope of Alaska, as well as its interest 386 customary adjustments. recognition of approximately $ 297 114 PP&E, $ 20 14 59 included in our Alaska segment. As discussed in the Clair Field transaction with BP 2018. 1,490 comprised of the fair value of $ 1,743 16.5 24 interest in the Clair Field, reduced by the net proceeds 253 approximately $ 1.9 42 15 investments, $ 374 100 are included in our Alaska segment.

Investments, Loans and Long-Ter

Investments, Loans and Long-Term Receivables	12 Months Ended
	Dec. 31, 2020
Investments, Loans and Long-Term Receivables and Joint Venture Acquisition Obligation [Abstract]
Investments, Loans and Long-Term Receivables	Note 5—Investments, Loans and Long-Term Receivables Components of investments, loans and long-term Millions of Dollars 2020 2019 Equity investments $ 7,596 8,234 Loans and advances—related parties 114 219 Long-term receivables 137 243 Long-term investments in debt securities 217 133 Other investments 67 77 $ 8,131 8,906 Equity Investments Affiliated companies in which we had a significant APLNG— 37.5 37.5 25 to produce CBM from the Bowen and Surat basins in Queensland, Australia, as well as process LNG. Qatar Liquefied Gas Company Limited (3) (QG3)—30 percent owned Petroleum ( 68.5 1.5 Qatar’s North Field, as well as exports LNG. Summarized 100 percent earnings information combined, was as follows: Millions of Dollars 2020 2019 2018 Revenues $ 7,931 11,310 11,654 Income before income taxes 1,843 3,726 3,660 Net income 1,426 3,085 3,244 Summarized 100 percent balance sheet information combined, was as follows: Millions of Dollars 2020 2019 Current assets $ 2,579 3,289 Noncurrent assets 35,257 38,905 Current liabilities 2,110 2,603 Noncurrent liabilities 18,099 22,168 Our share of income taxes incurred directly affiliates, and as such is not included in income taxes At December 31, 2020, retained earnings included 41 affiliated companies. 1,076 1,378 $ 1,226 APLNG APLNG is a joint venture focused on producing Australia. markets. position. supplemented with sales of additional LNG spot integrated Australian energy company, is the operator of APLNG’s production and pipeline system, while we operate the LNG facility. APLNG executed project financing agreements 8.5 billion project finance facility was initially composed Export-Import Bank of the United States for approximately 2.9 approximately $ 2.7 approximately $ 2.9 interest repayment in March 2017 and is scheduled bi-annual APLNG made a voluntary repayment of $ 1.4 At the same time, APLNG obtained a United 1.4 APLNG made its first interest payment related to scheduled to commence in September 2023, bi-annual During the first quarter of 2019, APLNG refinanced 3.2 transactions. 2.6 APLNG made its first principal and interest bi-annual facility until March 2028. 0.6 billion. commence in September 2023, with bi-annual In conjunction with the $ 3.2 finance debt, APLNG made voluntary repayments 2.2 1.0 and international commercial banks and the Export-Import At December 31, 2020, a balance of $ 6.2 for additional information. During the fourth quarter of 2020, the estimated below carrying value, primarily due to the weakening on a review of the facts and circumstances surrounding was not other than temporary under the guidance Joint Ventures.” commodity and exchange rate markets; (2) APLNG; and (3) the short length of time and extent value exceeded carrying value as of September discounted cash flow model using the following outlook of future prices from a combination of exchanges and our internal outlook (long-term), operating rates provided by a third party, and a discount rate believed to be consistent market participants. At December 31, 2020, the fair value of our investment 6,560 resulting in a not other than temporary impairment 112 relationship between the carrying value and fair been a loss in the value of our investment equity investment, calculated as the total difference between reporting period. At December 31, 2020, the carrying value of 6,672 The historical cost basis of our 37.5 6,242 resulting in a basis difference of $ 430 associated with PP&E and subject to amortization, individual exploration and production license areas production. exploration license area will periodically be reviewed required, would result in acceleration of basis gas from each license, we amortize the basis method. expense of $ 41 36 44 difference on currently producing licenses. QG3 QG3 is a joint venture that owns an integrated financing, with a current outstanding balance 220 Term Receivables.” excluding the project financing, was $ 742 Pass LNG Terminal and affiliated Golden Pass Pipeline near Sabine Pass, Texas, intended to provide us with terminal and pipeline capacity for the receipt, previously held a 12.4 those interests in the second quarter of 2019 while from QG3 is being sold to markets outside of Acquisitions and Dispositions. Loans and Long-Term Receivables As part of our normal ongoing business operations numerous agreements with other parties to pursue and long-term receivables to certain affiliated transferred or seller financing is provided to the agreement. decrease as interest and principal payments are interest rate. balance may not be fully recovered. At December 31, 2020, significant loans to affiliated 220 QG3. 30 participants in the project are affiliates of Qatar Petroleum $ 4.0 1.3 1.5 billion from commercial banks, and $ 1.2 substantially the same terms as the ECA and commercial achieved financial completion and all project loan facilities Semi-annual The long-term portion of these loans is included consolidated balance sheet, while the short-term

Investment in Cenovus Energy

Investment in Cenovus Energy	12 Months Ended
	Dec. 31, 2020
Investment in Cenovus Energy [Abstract]
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]	Note 6—Investment in Cenovus Energy On May 17, 2017, we completed the sale of our 50 well as the majority of our western Canada gas included 208 million Cenovus Energy common shares, 16.9 and outstanding Cenovus Energy common stock. 208 million Cenovus Energy common shares was $ 1.96 9.41 the closing date. At December 31, 2020, the investment included on 1.26 carried at fair value. 208 price of $ 6.04 855 fair value of $ 2.11 recorded within the “Other income (loss)” line of December 31, 2020 relating to the shares held recorded an unrealized gain of $ 649 437 14—Fair Value Measurement and Note 21—Other Financial Information, for additional information. to market conditions, we intend to decrease our agreements or otherwise. On January 4, 2021, Cenovus Energy completed its this transaction, our investment now approximates 10 common stock.

Suspended Wells

Suspended Wells	12 Months Ended
	Dec. 31, 2020
Suspended Wells [Abstract]
Suspended Wells	Note 7—Suspended Wells and Exploration Expenses The following table reflects the net changes in suspended Millions of Dollars 2020 2019 2018 Beginning balance at January 1 $ 1,020 856 853 Additions pending the determination of proved reserves 164 239 140 Reclassifications to proved properties (42) (11) (37) Sales of suspended wells (313) (54) (93) Charged to dry hole expense (147) (10) (7) Ending balance at December 31 $ 682 1,020 * 856 *Includes $ 313 For additional details on suspended wells charged to dry hole expense, see the The following table provides an aging of suspended Millions of Dollars 2020 2019 2018 Exploratory well costs capitalized for a period $ 156 206 145 Exploratory well costs capitalized for a period 526 814 711 Ending balance $ 682 1,020 * 856 Number of projects with exploratory well costs period greater than one year 22 23 24 *Includes $ 313 The following table provides a further aging of than one year since the completion of drilling Millions of Dollars Suspended Since Total 2017–2019 2014–2016 2004–2013 NPRA—Alaska (1) 240 190 50 - Surmont—Canada (1) 120 4 31 85 Narwhal Trend—Alaska (1) 52 52 - - PL782S—Norway (1) 22 22 - - WL4-00—Malaysia (1) 17 17 - - NC 98—Libya (2) 13 - 9 4 Other of $10 million or less each (1)(2) 62 26 19 17 Total $ 526 311 109 106 (1)Additional appraisal wells planned. (2)Appraisal drilling complete; costs being incurred to assess development. Exploration Expenses The charges discussed below are included in the “Exploration statement. 2020 In our Alaska segment, we recorded a before-tax impairment 828 value of capitalized undeveloped leasehold costs along with affiliates of Exxon Mobil Corporation, (AGDC), a state-owned corporation, completed which would liquefy and export natural gas from along with the affiliates of ExxonMobil and BP, indicated our intention not to progress into the next phase the project due to changes in the economic environment; focusing primarily on permitting efforts. project. current market for the asset. In our Other International segment, our interests majeure. before-tax expense totaling $ 84 the associated capitalized undeveloped leasehold carrying In our Asia Pacific segment, we recorded before-tax 50 previously suspended well and an impairment value associated with the Kamunsu East Field 2019 In our Lower 48 segment, we recorded a before-tax impairment 141 value of capitalized undeveloped leasehold costs 111 decision to discontinue exploration activities

Impairments

Impairments	12 Months Ended
	Dec. 31, 2020
Impairment Of Long Lived Assets [Abstract]
Impairments	Note 8—Impairments During 2020, 2019 and 2018, we recognized the Millions of Dollars 2020 2019 2018 Alaska $ - - 20 Lower 48 804 402 63 Canada 3 2 9 Europe, Middle East and North Africa 6 1 (79) Asia Pacific - - 14 $ 813 405 27 2020 During 2020, we recorded impairments of $ 813 Lower 48. 2020, we recorded impairments of $ 523 consisting of developed properties in the 2020. recognized additional impairments of $ 287 Fair Value Measurement, for additional information. 2019 In the Lower 48, we recorded impairments 402 Niobrara asset which were written down to fair value Dispositions, 2018 In Alaska, we recorded impairments of $ 20 In the Lower 48, we recorded impairments 63 Barnett asset which were written down to fair value finalized proceeds on a separate transaction. In our Europe, Middle East and North Africa segment, 79 primarily due to decreased ARO estimates on fields prior years, partly offset by an increased ARO estimate

Asset Retirement Obligations an

Asset Retirement Obligations and Accrued Environmental Costs	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations and Accrued Environmental Costs	Note 9—Asset Retirement Obligations and Accrued Asset retirement obligations and accrued environmental Millions of Dollars 2020 2019 Asset retirement obligations $ 5,573 6,206 Accrued environmental costs 180 171 Total asset retirement obligations and accrued environmental costs 5,753 6,377 Asset retirement obligations and accrued environmental (323) (1,025) Long-term asset retirement obligations and accrued $ 5,430 5,352 Asset Retirement Obligations We record the fair value of a liability for an ARO when it is incurred (typically when the production location). cost by increasing the carrying amount of the related liability changes, we will record an adjustment increases for the change in its present value, related asset. We have numerous AROs we are required to perform under law or contract once out of service. future and will be funded from general company obligations involve plugging and abandonment platforms around the world, as well as oil and During 2020 and 2019, our overall ARO changed Millions of Dollars 2020 2019 Balance at January 1 $ 6,206 7,908 Accretion of discount 248 322 New obligations 262 155 Changes in estimates of existing obligations (307) 50 Spending on existing obligations (116) (229) Property dispositions (771) (1,920) Foreign currency translation 51 (80) Balance at December 31 $ 5,573 6,206 Accrued Environmental Costs Total accrued environmental costs at December 31, 2020 and 2019, were $ 180 171 respectively. We had accrued environmental costs of $ 116 112 respectively, related to remediation activities in the U.S. and Canada. Other $ 48 47 December 31, 2020 and 2019, respectively. 16 12 December 31, 2020 and 2019, respectively, where the company has been named under the Federal Comprehensive Environmental laws. 30 Expected expenditures for environmental obligations using a weighted-average 5 liabilities of $ 106 portion of the accrued environmental costs that 23 17 2022, $ 18 3 2 103 after 2025.	*Classified as a current liability on the balance sheet under “Other accruals.” For 741 as of December 31, 2019, and subsequently sold in 2020. For

Debt

Debt	12 Months Ended
	Dec. 31, 2020
Debt [Abstract]
Debt	Note 10—Debt Long-term debt at December 31 was: Millions of Dollars 2020 2019 9.125 % Debentures due 2021 $ 123 123 2.4 % Notes due 2022 329 329 7.65 % Debentures due 2023 78 78 3.35 % Notes due 2024 426 426 8.2 % Debentures due 2025 134 134 3.35 % Notes due 2025 199 199 6.875 % Debentures due 2026 67 67 4.95 % Notes due 2026 1,250 1,250 7.8 % Debentures due 2027 203 203 7.375 % Debentures due 2029 92 92 7 % Debentures due 2029 200 200 6.95 % Notes due 2029 1,549 1,549 8.125 % Notes due 2030 390 390 7.2 % Notes due 2031 575 575 7.25 % Notes due 2031 500 500 7.4 % Notes due 2031 500 500 5.9 % Notes due 2032 505 505 4.15 % Notes due 2034 246 246 5.95 % Notes due 2036 500 500 5.951 % Notes due 2037 645 645 5.9 % Notes due 2038 600 600 6.5 % Notes due 2039 2,750 2,750 4.3 % Notes due 2044 750 750 5.95 % Notes due 2046 500 500 7.9 % Debentures due 2047 60 60 Floating rate notes due 2022 at 1.12 % – 2.81 % during 2020 and 2.81 % – 3.58 % during 2019 500 500 Marine Terminal Revenue Refunding Bonds due 2031 at 0.1 % – 7.5 % during 1.08 % – 2.45 % during 2019 265 265 Industrial Development Bonds due 2035 at 0.11 % – 7.5 % during 2020 and 1.08 % – 2.45 % during 2019 18 18 Commercial Paper at 0.08 % – 0.23 % during 2020 300 Other 38 17 Debt at face value 14,292 13,971 Finance leases 891 720 Net unamortized premiums, discounts and 186 204 Total debt 15,369 14,895 Short-term debt (619) (105) Long-term debt $ 14,750 14,790 Maturities of long-term borrowings, inclusive 2025 are: $ 619 1,001 259 579 465 We have a revolving credit facility totaling $ 6.0 credit facility may be used for direct bank borrowings, 500 million, among financial institutions and does not contain requiring maintenance of specified financial default provision relating to the failure to pay principal 200 more by ConocoPhillips, or any of its consolidated redetermination prior to its expiration date. Credit facility borrowings may bear interest at London interbank market or at a margin above the overnight certain designated banks in the U.S. amounts. successors cease to be a majority of the Board The revolving credit facility supports our ability 6.0 primarily a funding source for short-term working capital limited to 90 days . 300 included in the short-term debt on our consolidated 300 outstanding and no 5.7 capacity under our revolving credit facility no credit, nor outstanding commercial paper as At both December 31, 2020 and 2019, we had 283 outstanding with maturities ranging through 2035. bondholders on any business day. long-term basis, therefore, the VRDBs are included sheet. For information on Finance Leases, see Note 16—Non-Mineral On January 15, 2021, we completed the acquisition we assumed Concho’s publicly traded debt, which was recorded at fair value 4.7 date. On December 7, 2020, we launched a debt approximately $ 3.9 98 percent, or approximately $ 3.8 The new debt received in the exchange is fully In conjunction with the exchange offer, Concho successfully solicited indentures governing the Concho notes to eliminate and the requirements for certain Concho subsidiaries the acquisition see Note 25—Acquisition of Concho

Guarantees

Guarantees	12 Months Ended
	Dec. 31, 2020
Guarantees [Abstract]
Guarantees	Note 11—Guarantees At December 31, 2020, we were liable for certain arrangements as described below. a guarantor for newly issued or modified guarantees. below, we have not recognized a liability because the fair value of the obligation unless otherwise stated, we are not currently future performance to be either immaterial APLNG Guarantees At December 31, 2020, we had outstanding multiple 37.5 interest in APLNG. 2020 exchange rates: ● During the third quarter of 2016, we issued a guarantee portion of the funds in a project finance reserve guarantee to be 10 years . 170 and may become payable if an enforcement action against APLNG. 14 million. ● In conjunction with our original purchase of an ownership October 2008, we agreed to reimburse Origin arising under guarantees of an existing obligation agreements with remaining terms of 1 to 21 years . payments, or cost of volume delivery, under these guarantees is estimated to 770 1.4 billion in the event of intentional or reckless breach) meet its obligations under these agreements and payments are considered unlikely, as the payments, or cost of volume delivery, would only be triggered if APLNG does not have enough natural venturers do not make necessary equity contributions ● We have guaranteed the performance of APLNG with regard to certain other contracts connection with the project’s continued development. 16 to 25 years or the life of the venture . guarantees is approximately $ 130 December 31, 2020, the carrying value of these 7 Other Guarantees We have other guarantees with maximum future potential payment amounts totaling $ 730 of the residual value of corporate aircraft, reserve accounts. six years certain asset values are lower than guaranteed conditions decline at guaranteed entities, parties. 11 Indemnifications Over the years, we have entered into agreements to ventures and assets that gave rise to qualifying for taxes and environmental liabilities. majority of these expire in 2021. and the maximum amounts these indemnifications at December 31, 2020, was 50 indemnification liability over the relevant time facts and circumstances surrounding each type indefinite, we will reverse the liability when amortize the liability over an appropriate time declines. of the indemnifications, it is not possible to make future payments. Commitments.

Contingencies and Commitments

Contingencies and Commitments	12 Months Ended
	Dec. 31, 2020
Contingencies and Commitments [Abstract]
Contingencies and Commitments	Note 12—Contingencies and Commitments A number of lawsuits involving a variety of claims against ConocoPhillips. placement, storage, disposal or release of certain and inactive sites. contingencies. liability when the loss is probable and the amount reasonably estimated and no amount within the range end of the range is accrued. We accrue receivables for insurance or other third-party recoveries when applicable. tax-related contingencies, we use a cumulative probability-weighted tax position is less than certain. related contingencies. Based on currently available information, we believe liability exposures will exceed current accruals by consolidated financial statements. both with respect to accrued liabilities changes include contingent liabilities Estimated future environmental remediation magnitude of cleanup costs, the unknown time the determination of our liability in proportion related to tax and legal matters are subject to available during the administrative and litigation Environmental We are subject to international, federal, state and local environmental laws and regulations. our consolidated financial statements, we record best estimates, using all information that is currently available facts, existing technology, and presently enacted laws stakeholder and business considerations. experience in remediation of contaminated sites, the U.S. EPA or other organizations. liabilities, and we accrue them in the period they Although liability of those potentially responsible several for federal sites and frequently so for other particular site. any site at which we have been designated as a in sharing cleanup costs with other financially responsible are still under investigation by the potentially responsible normally assess the appropriate remediation. Where it appears that other potentially responsible share, we consider this inability in estimating As a result of various acquisitions in the past, environmental obligations are mitigated by indemnifications indemnifications are subject to dollar limits We are currently participating in environmental assessments and cleanups at numerous comparable state and international sites. other costs, we make accruals on an undiscounted combination, which we record on a discounted sites where it is probable future costs will be incurred not reduced these accruals for possible insurance recoveries. environmental assessments, cleanups and proceedings. Accrued Environmental Costs, for a summary of our Litigation and Other Contingencies We are subject to various lawsuits and claims including but not limited to matters and severance tax payments, gas measurement and damages, climate change, personal injury, and property damage. relate to alleged royalty and tax underpayments claims of alleged environmental contamination vigorously in these matters. Our legal organization applies its knowledge, experience characteristics of our cases, employing a litigation proceedings against us. individual cases. mediation. available information about current developments adequacy of current accruals and determines if accruals, is required. We have contingent liabilities resulting from throughput agreements with pipeline and not associated with financing arrangements. company with additional funds through advances utilized. $ 249 supplies, commercial activities and services incident In 2007, ConocoPhillips was unable to reach by the Venezuelan government’s Nationalization Decree. Petróleos de Venezuela, S.A. (PDVSA), or its affiliates, directly assumed control over ConocoPhillips’ interests in the Petrozuata and Hamaca heavy oil response to this expropriation, ConocoPhillips ICSID. ConocoPhillips’ significant oil investments decision that the expropriation was unlawful. government of Venezuela to pay ConocoPhillips approximately $ 8.7 government’s unlawful expropriation of the company’s investments in Venezuela in 2007. filed a request for recognition of the award in several issued a decision rectifying the award and reducing 227 at $ 8.5 annulment proceedings are underway. In 2014, ConocoPhillips filed a separate and independent PDVSA under the contracts that had established the an award in April 2018, finding that PDVSA owed 2 under their agreements in connection with the expropriation of the projects and other pre-expropriation fiscal measures. In August 2018, ConocoPhillips entered into a settlement with PDVSA to recover the full amount of this ICC award, plus interest through the payment period, including initial payments totaling approximately $500 million within a period of 90 days from the time of signing of the settlement agreement. The balance of the settlement is to be paid quarterly over a period of four and a half years. approximately $ 754 jurisdictions, and ConocoPhillips agreed to suspend of default to PDVSA on October 14 and November As a result, ConocoPhillips has resumed legal enforcement settlement and any actions taken in enforcement including those related to any applicable sanctions In 2016, ConocoPhillips filed a separate and independent PDVSA under the contracts that had established the awarded ConocoPhillips approximately $ 33 ConocoPhillips is seeking recognition and enforcement has ensured that all the actions related to the award including those related to any applicable sanctions The Office of Natural Resources Revenue (ONRR) has royalties on federal lands and has issued multiple ConocoPhillips has appealed these orders and with the Interior Board of Land Appeals (IBLA), ConocoPhillips filed in 2016 in New Mexico Beginning in 2017, governmental and other entities and gas companies, including ConocoPhillips, alleged climate change impacts. amounts claimed by plaintiffs are unspecified and the legal unprecedented. inappropriate vehicle to address the challenges against such lawsuits. Several Louisiana parishes and the State of Louisiana Coastal Resources Management Act (SLCRMA) seeking compensatory damages for contamination historical oil and gas operations. vigorously defend against them. about these claims (both as to scope and damages) In 2016, ConocoPhillips, through its subsidiary, The Louisiana Land and submitted claims as the largest private wetlands owner in administration process related to the oil spill administrator issued an award to the company 90 million, and was received in the third quarter In October 2020, the Bureau of Safety and Environmental Outer Continental Shelf (OCS) Lease P-0166, including including two offshore platforms located near Carpinteria, owner of OCS Lease P-0166 relinquished the Petroleum Company, a legacy company of ConocoPhillips, held a 25 percent interest these facilities, but sold its interest approximately the operation or production on this lease since that Long-Term Throughput Agreements and Take We have certain throughput agreements and take-or-pay agreements in support of financing arrangements. The agreements typically provide for natural gas the company’s business. 2021—$ 7 7 7 7 7 after—$ 51 25 25 $ 39

Derivative and Financial Instru

Derivative and Financial Instruments	12 Months Ended
	Dec. 31, 2020
Derivative and Financial Instruments [Abstract]
Derivative and Financial Instruments	Note 13—Derivative and Financial Instruments We use futures, forwards, swaps and options in various markets to meet our customer opportunities, and manage foreign exchange currency Commodity Derivative Instruments Our commodity business primarily consists Commodity derivative instruments are held at balances have the right of setoff, they are presented on operating activities on our consolidated statement realized and unrealized gains and losses are recognized business or a net basis if held for trading. with the NPNS exception are recognized upon contracts. The following table presents the gross fair values line items where they appear on our consolidated Millions of Dollars 2020 2019 Assets Prepaid expenses and other current assets $ 229 288 Other assets 26 34 Liabilities Other accruals 202 283 Other liabilities and deferred credits 18 28 The gains (losses) from commodity derivatives consolidated income statement were: Millions of Dollars 2020 2019 2018 Sales and other operating revenues $ 19 141 45 Other income (loss) 4 4 7 Purchased commodities 11 (118) (41) The table below summarizes our material net exposures contracts: Open Position Long/(Short) 2020 2019 Commodity Natural gas and power (billions of cubic feet equivalent) Fixed price (20) (5) Basis (10) (23) Foreign Currency Exchange Derivatives We have foreign currency exchange rate risk resulting from international operations. exchange derivative activity primarily exposures, such as firm commitments for returns from net investments in foreign affiliates, and investments The following table presents the gross fair values collateral, and the line items where they appear Millions of Dollars 2020 2019 Assets Prepaid expenses and other current assets $ 2 1 Liabilities Other accruals 16 20 Other liabilities and deferred credits - 8 The (gains) losses from foreign currency exchange on our consolidated income statement were: Millions of Dollars 2020 2019 2018 Foreign currency transaction (gains) losses $ (40) 16 1 We had the following net notional position of outstanding foreign currency exchange In Millions Notional Currency 2020 2019 Foreign Currency Exchange Derivatives Buy British pound, sell euro GBP - 4 Sell British pound, buy euro GBP 5 - Sell Canadian dollar, buy U.S. dollar CAD 370 1,337 At December 31, 2020, we had outstanding foreign currency exchange forward contracts to sell $0.45 billion CAD at $0.748 CAD against the U.S. dollar. At December 31, 2019, we had outstanding foreign currency exchange forward contracts to sell $1.35 billion CAD at $0.748 CAD against the U.S. dollar . Financial Instruments We invest in financial instruments with maturities based on our cash forecasts for currency pools we manage. ● Time deposits: Interest bearing deposits placed with financial of time. ● Demand deposits: withdrawn without notice. ● Commercial paper: Unsecured promissory notes issued government agency purchased at a discount to ● U.S. government or government agency obligations: government agencies. ● Foreign government obligations: Securities ● Corporate bonds: ● Asset-backed securities: Collateralized debt securities. The following investments are carried on our table reflects remaining maturities at December Millions of Dollars Carrying Amount Cash and Cash Equivalents Short-Term Investments Investments and Long- Term Receivables 2020 2019 2020 2019 2020 2019 Cash $ 597 759 Demand Deposits 1,133 1,483 Time Deposits 1 to 90 days 1,225 2,030 2,859 1,395 91 to 180 days 448 465 Within one year 13 - One year through five years 1 - Commercial Paper 1 to 90 days - 413 - 1,069 U.S. Government Obligations 1 to 90 days 23 394 - - $ 2,978 5,079 3,320 2,929 1 - The following investments in debt securities balance sheet at fair value as of December 31, Millions of Dollars Carrying Amount Cash and Cash Equivalents Short-Term Investments Investments and Long- Term Receivables 2020 2019 2020 2019 2020 2019 Major Security Type Corporate Bonds $ - 1 130 59 143 99 Commercial Paper 13 8 155 30 U.S. Government Obligations - - 4 10 13 15 U.S. Government Agency 17 - Foreign Government Obligations 2 - Asset-backed Securities - - 41 19 $ 13 9 289 99 216 133 Cash and Cash Equivalents and Short-Term Investments have remaining maturities Investments and Long-Term Receivables have remaining maturities The following table summarizes the amortized classified as available for sale: Millions of Dollars Amortized Cost Basis Fair Value 2020 2019 2020 2019 Major Security Type Corporate bonds $ 271 159 273 159 Commercial paper 168 38 168 38 U.S. government obligations 17 25 17 25 U.S. government agency obligations 17 - 17 - Foreign government obligations 2 - 2 - Asset-backed securities 41 19 41 19 $ 516 241 518 241 As of December 31, 2020 and December 31, 2019, available for sale with net losses were negligible. 2019, investments in these debt securities losses has not been recorded were negligible. For the year ended December 31, 2020, proceeds classified as available for sale were $ 422 those sales and redemptions were negligible. specific identification method. Credit Risk Financial instruments potentially exposed to concentrations short-term investments, long-term investments receivables. government money market funds, government debt financial institutions, placed in high-quality corporate bonds, U.S. government government obligations, and asset-backed securities. The credit risk from our OTC derivative contracts, counterparty to the transaction. limits and includes the use of cash-call margins when appropriate, nonperformance. these trades are cleared primarily with an exchange requirements until settled; however, we are exposed to the credit arising from daily margin cash calls, as well as for cash Our trade receivables result primarily international customer base, which limits our receivables have payment terms of 30 days or less , and we continually monitor this exposure and creditworthiness of the counterparties. including, letters of credit, prepayments and surety credit risk with counterparties that both buy from by us or owed to others to be offset against amounts Certain of our derivative instruments contain provisions that require us to post collateral if the derivative exposure exceeds a threshold amount. We have contracts with fixed threshold amounts and other contracts with variable threshold amounts that are contingent on our credit rating. The variable threshold amounts typically decline for lower credit ratings, while both the variable and fixed threshold amounts typically revert to zero if we fall below investment grade. Cash is the primary collateral in all contracts; however, many also permit us to post letters of credit as collateral, such as transactions administered through the New York Mercantile Exchange. The aggregate fair value of all derivative in a liability position on December 31, 2020 and 25 79 respectively. no collateral If our credit rating had been downgraded below required to post $ 23

Fair Value Measurement

Fair Value Measurement	12 Months Ended
	Dec. 31, 2020
Fair Value Measurement [Abstract]
Fair Value Measurement	Note 14—Fair Value Measurement We carry a portion of our assets and liabilities at fair value that are measured at the reporting price (i.e., the price that would be received to sell according to the quality of valuation inputs under ● Level 1: Quoted prices (unadjusted) in an active ● Level 2: Inputs other than quoted prices that ● Level 3: Unobservable inputs that are significant The classification of an asset or liability that are initially classified as Level 3 are subsequently unobservable inputs is inconsequential to the overall available. corroborated market data is no longer available. 2020 or 2019. Recurring Fair Value Measurement Financial assets and liabilities reported at fair Cenovus Energy common shares, commodity derivatives. ● Level 1 derivative assets and liabilities primarily valued using unadjusted prices available from the investment in common shares of Cenovus Energy, which is valued using quotes for shares and our investments in U.S. government obligations are valued using exchange prices. ● Level 2 derivative assets and liabilities primarily sale contracts that are valued using adjusted exchange companies that are all corroborated by market securities classified as available for sale including asset-backed securities, U.S. government agency valued using pricing provided by brokers or pricing data. ● Level 3 derivative assets and liabilities consist contracts where a significant portion of fair readily available. relationships among various commodities, modeled relevant economic measures. Level 3 activity was not material for all The following table summarizes the fair value unadjusted where the right of setoff exists for commodity basis): Millions of Dollars December 31, 2020 December 31, 2019 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Investment in Cenovus Energy $ 1,256 - - 1,256 2,111 - - 2,111 Investments in debt securities 17 501 - 518 25 216 - 241 Commodity derivatives 142 101 12 255 172 114 36 322 Total assets $ 1,415 602 12 2,029 2,308 330 36 2,674 Liabilities Commodity derivatives $ 120 91 9 220 174 115 22 311 Total liabilities $ 120 91 9 220 174 115 22 311 The following table summarizes those commodity presented on our consolidated balance sheet. multiple derivative instruments executed with the same right of setoff exists. Millions of Dollars Amounts Subject to Right of Setoff Gross Amounts Not Gross Net Amounts Subject to Gross Amounts Amounts Cash Net Recognized Right of Setoff Amounts Offset Presented Collateral Amounts December 31, 2020 Assets $ 255 2 253 157 96 10 86 Liabilities 220 1 219 157 62 4 58 December 31, 2019 Assets $ 322 3 319 193 126 4 122 Liabilities 311 4 307 193 114 12 102 At December 31, 2020 and December 31, 2019, balance sheet where we had the right of setoff. Non-Recurring Fair Value Measurement The following table summarizes the fair value assets accounted for at fair value on a non-recurring Millions of Dollars Fair Value Measurements Using Fair Value Level 1 Inputs Level 2 Inputs Level 3 Inputs Before-Tax Loss Year Net PP&E (held for use) $ 65 - - 65 522 268 - - 268 287 Year Net PP&E (held for sale) $ 194 194 - - 351 166 166 - - 28 Equity Method Investments 171 171 - - 60 30 - 30 - 95 Net PP&E (held for use) During 2020, the estimated fair value of certain amounts below the carrying values. estimated based on internal discounted cash flow models future production, an outlook of future prices from pricing service companies and our internal outlook and a discount rate believed to be consistent The range and arithmetic average of significant unobservable inputs significant assets were as follows: Fair Value (Millions of Dollars) Valuation Technique Unobservable Inputs Range (Arithmetic Average) March 31, 2020 Wind River Basin $ 65 Discounted cash flow Natural gas production (MMCFD) 8.4 55.2 22.9 ) Natural gas price outlook* ($/MMBTU) $ 2.67 9.17 5.68 ) Discount rate** 7.9 % 9.1 % ( 8.3 %) 2.2 % annually after year 2034. **Determined as the weighted average cost of capital of a group Fair Value (Millions of Dollars) Valuation Technique Unobservable Inputs Range (Arithmetic Average) December 31, 2020 Central Basin Platform $ 244 Discounted cash flow Commodity production (MBOED) 0.5 12.7 3.4 ) Commodity price outlook* ($/BOE) $ 37.35 115.29 ($ 73.80 ) Discount rate** 6.8 % 7.7 % ( 7.4 %) *Commodity price outlook based on a combination of external pricing 2.0% annually after year 2050. **Determined as the weighted average cost of capital of a group Net PP&E (held for sale) Net PP&E held for sale was written down to fair determined by their negotiated selling prices Acquisitions and Dispositions. Equity Method Investments During 2019, certain equity method investments amounts, and the impairments were considered to Topic 323. negotiated selling prices. Note 5—Investments, Loans and Long-Term Receivables. determined to have a fair value below its Reported Fair Values of Financial Instruments We used the following methods and assumptions to estimate the fair value of financial ● Cash and cash equivalents and short-term investments: sheet approximates fair value. the carrying amount reported on the balance sheet ● Accounts and notes receivable (including long-term reported on the balance sheet approximates fair estimate the fair value of the current portion and advances—related parties. ● Investment in Cenovus Energy: See Note 6—Investment carrying value and fair value of our investment in ● Investments in debt securities classified as available securities categorized as Level 1 in the fair fair value of investments in debt securities measured using pricing provided by brokers or market data. ● Loans and advances—related parties: The carrying value. categorized as Level 2 in the fair value hierarchy. Receivables, for additional information. ● Accounts payable (including related parties) payable and floating-rate debt reported on the balance ● Fixed-rate debt: The estimated fair value of fixed-rate pricing service that is corroborated by market 2 in the fair value hierarchy. ● Commercial paper: The carrying amount of our and is reported on the balance sheet as short-term information The following table summarizes the net fair setoff exists for commodity derivatives): Millions of Dollars Carrying Amount Fair Value 2020 2019 2020 2019 Financial assets Investment in Cenovus Energy $ 1,256 2,111 1,256 2,111 Commodity derivatives 88 125 88 125 Investments in debt securities 518 241 518 241 Loans and advances—related parties 220 339 220 339 Financial liabilities Total debt, excluding finance leases 14,478 14,175 19,106 18,108 Commodity derivatives 59 106 59 106 Commodity Derivatives At December 31, 2020, commodity derivative 10 obligations to return cash collateral and $ 4 December 31, 2019, commodity derivative assets 4 obligations to return cash collateral and $ 12

Equity

Equity	12 Months Ended
	Dec. 31, 2020
Equity [Abstract]
Equity	Note 15—Equity Common Stock The changes in our shares of common stock, as categorized Shares 2020 2019 2018 Issued Beginning of year 1,795,652,203 1,791,637,434 1,785,419,175 Distributed under benefit plans 3,192,064 4,014,769 6,218,259 End of year 1,798,844,267 1,795,652,203 1,791,637,434 Held in Treasury Beginning of year 710,783,814 653,288,213 608,312,034 Repurchase of common stock 20,018,275 57,495,601 44,976,179 End of year 730,802,089 710,783,814 653,288,213 Preferred Stock We have authorized 500 0.01 none or outstanding at December 31, 2020 or 2019. Noncontrolling Interests In the second quarter of 2020, we completed the assets and operations. ventures in which there was a noncontrolling noncontrolling interests. 69 ventures. Repurchase of Common Stock In late 2016, we initiated our current share repurchase authorization of $ 25 892 3,500 million, $ 2,999 and third quarters of 2020 in response to the economic share repurchases, repurchasing $ 0.2 entry into a definitive agreement to acquire Concho. following our Concho acquisition. 189 million shares at a cost of $ 10,517

Non Mineral Leases

Non Mineral Leases	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Non-Mineral Leases	Note 16—Non-Mineral Leases The company primarily leases office buildings and drilling tugboats, corporate aircraft, and other facilities adjusting rental payments to reflect changes in price vary based on the nature of usage of the leased that provide it with the option to extend or renew the lease term, or purchase the leased asset as executed lease agreements that require it to additional information about guarantees, see imposed on us by the lease agreements with regard Certain arrangements may contain both lease and or contains a lease at contract inception. (ASC Topic 842) and its amendments, beginning January 1, 2019. FASB ASC Topic arrangements are subject to the provisions of other applicable accounting guidance; however, we have elected to adopt the optional practical expedient not to separate lease components apart from non-lease components for accounting purposes. has been adopted for each of the company’s leased asset classes existing the transition provisions of ASC Topic 842 and will be applied to all new or after January 1, 2019. asset class, the company will determine at expedient to the new leased asset class. Leases are evaluated for classification as operating and right-of-use assets and corresponding liabilities the present value of future lease payments relating Future lease payments include variable lease payments rate at the commencement date and probable future lease payments may be increased to include and/or purchase options when the company has generally due to limited asset availability options. lease payments, unless the interest rate payments that vary subsequent to the commencement asset activities, or certain other contingencies are and corresponding liabilities. sheet for lease arrangements with terms of 12 months We often enter into leasing arrangements acting in the capacity as operator for and/or and gas joint ventures of undivided interests. as operator and there is no separate arrangement to recognize at lease commencement a right-of-use balance sheet on a gross basis. statement and statement of cash flows, such costs coventurers for their share of the lease cost as the underlying As a result, lease cost is presented in our consolidated proportional basis. lease liability only if we were a specified contractual be legally enforced against us. corresponding lease liability on our consolidated undivided interest ownership in the related joint The company has historically recorded certain under the proportionate consolidation method of basis consistent with its ownership interest recorded finance lease assets and liabilities basis pursuant to accounting guidance applicable provisions of ASC Topic 842, and since we have elected to adopt the package practical expedients, the historical accounting treatment to reconsideration upon the modification or expiration. The following table summarizes leases on our consolidated balance sheet as of December Millions of Dollars 2020 2019 Operating Leases Finance Leases Operating Leases Finance Leases Right-of-Use Assets Properties, plants and equipment Gross $ 1,375 1,039 Accumulated DD&A (721) (649) Net PP&E * 654 390 Prepaid expenses and other current assets $ - 40 Other assets 783 896 Lease Liabilities Short-term debt ** $ 168 87 Other accruals 226 347 Long-term debt *** 723 633 Other liabilities and deferred credits 559 585 Total lease liabilities $ 785 891 932 720 * 258 335 97 56 *** Includes proportionately consolidated finance lease liabilities of $ 522 579 The following table summarizes our lease costs Millions of Dollars 2020 2019 Lease Cost * Operating lease cost $ 321 341 Finance lease cost Amortization of right-of-use assets 163 99 Interest on lease liabilities 34 37 Short-term lease cost ** 42 77 Total lease cost *** $ 560 554 * The amounts presented in the table above have not been adjusted to reflect amounts recovered or reimbursed from oil and gas coventurers. *** Variable lease cost and sublease income are immaterial for the periods presented and therefore are not included in the table above . The following table summarizes the lease terms 2020 2019 Lease Term and Discount Rate Weighted-average term (years) Operating leases 6.11 5.19 Finance leases 7.12 8.70 Weighted-average discount rate (percent) Operating leases 2.78 3.10 Finance leases 4.27 5.53 The following table summarizes other lease information Millions of Dollars 2020 2019 Other Information * Cash paid for amounts included in the measurement Operating cash flows from operating leases $ 232 203 Operating cash flows from finance leases 11 27 Financing cash flows from finance leases 255 81 Right-of-use assets obtained in exchange for $ 250 499 Right-of-use assets obtained in exchange for 426 26 *The amounts presented in the table above have not been adjusted to reflect amounts recovered or reimbursed from oil and gas coventurers. addition, pursuant to other applicable accounting guidance, lease are reported in the "Cash Flows From Investing Activities" section of our consolidated statement of cash flows. The following table summarizes future lease Millions of Dollars Operating Leases Finance Maturity of Lease Liabilities 2021 $ 245 213 2022 155 162 2023 116 148 2024 94 113 2025 55 87 Remaining years 200 320 Total * 865 1,043 Less: portion representing imputed interest (80) (152) Total lease liabilities $ 785 891 *Future lease payments for operating and finance leases commencing on or components in accordance with our election to adopt the optional practical components for accounting purposes. company have been included in the table on a proportionate basis consistent company or oil and gas venture. For the year ended December 31, 2018 operating Millions of Dollars Total rentals $ 253 Less: sublease rentals (16) $ 237

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2020
Compensation And Retirement Disclosure [Abstract]
Employee Benefit Plans	Note 17—Employee Benefit Plans Pension and Postretirement Plans An analysis of the projected benefit obligations our postretirement health and life insurance plans Millions of Dollars Pension Benefits Other Benefits 2020 2019 2020 2019 U.S. Int’l. U.S. Int’l. Change in Benefit Obligation Benefit obligation at January 1 $ 2,319 3,880 2,136 3,438 216 218 Service cost 85 54 79 69 2 1 Interest cost 66 85 79 97 6 8 Plan participant contributions - 1 - 2 18 20 Plan amendments - 2 - - (30) - Actuarial loss 319 398 278 387 7 27 Benefits paid (241) (151) (253) (147) (49) (59) Curtailment - 2 - (69) - - Recognition of termination benefits - 3 - 1 - - Foreign currency exchange rate change - 129 - 102 - 1 Benefit obligation at December 31 * $ 2,548 4,403 2,319 3,880 170 216 *Accumulated benefit obligation portion of above at $ 2,359 4,095 2,161 3,594 Change in Fair Value of Plan Assets Fair value of plan assets at January 1 $ 1,591 4,306 1,336 3,358 - - Actual return on plan assets 321 416 273 529 - - Company contributions 99 60 235 464 31 39 Plan participant contributions - 1 - 2 18 20 Benefits paid (241) (151) (253) (147) (49) (59) Foreign currency exchange rate change - 161 - 100 - - Fair value of plan assets at December 31 $ 1,770 4,793 1,591 4,306 - - Funded Status $ (778) 390 (728) 426 (170) (216) Millions of Dollars Pension Benefits Other Benefits 2020 2019 2020 2019 U.S. Int’l. U.S. Int’l. Amounts Recognized in the Consolidated Balance Sheet at December 31 Noncurrent assets $ - 746 - 765 - - Current liabilities (56) (11) (21) (6) (39) (42) Noncurrent liabilities (722) (345) (707) (333) (131) (174) Total recognized $ (778) 390 (728) 426 (170) (216) Weighted-Average Assumptions Used to Determine Benefit Obligations at December 31 Discount rate 2.30 % 1.80 3.25 2.35 2.15 3.10 Rate of compensation increase 4.00 3.10 4.00 3.35 Interest crediting rate for applicable benefits 2.10 - 4.10 - Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for Years Discount rate 3.05 % 2.35 3.95 2.90 3.10 4.05 Expected return on plan assets 5.80 3.60 5.80 4.10 Rate of compensation increase 4.00 3.35 4.00 3.65 Interest crediting rate for applicable benefits 4.10 - 4.35 - For both U.S. and international pensions, the expected future return of each asset class, weighted class. class of assets. The following tables set forth information related accumulated benefit obligations in excess of 2019: Millions of Dollars Pension Benefits 2020 2019 U.S. Int’l. U.S. Int’l. Pension Plans with Projected Benefit Obligation in Excess of Plan Assets Projected benefit obligation $ 2,548 391 2,319 355 Fair value of plan assets 1,770 35 1,591 44 Pension Plans with Accumulated Benefit Excess of Plan Assets Accumulated benefit obligation $ 2,359 338 2,161 299 Fair value of plan assets 1,770 35 1,591 44 Included in accumulated other comprehensive amounts that had not been recognized in net Millions of Dollars Pension Benefits Other Benefits 2020 2019 2020 2019 U.S. Int’l. U.S. Int’l. Unrecognized net actuarial loss $ 467 326 479 227 14 8 Unrecognized prior service credit - - - (2) (182) (183) Millions of Dollars Pension Benefits Other Benefits 2020 2019 2020 2019 U.S. Int’l. U.S. Int’l. Sources of Change in Other Comprehensive Income (Loss) Net gain (loss) arising during the period $ (83) (120) (79) 51 (7) (27) Amortization of actuarial (gain) loss included in income (loss)* 95 21 116 32 1 (2) Net change during the period $ 12 (99) 37 83 (6) (29) Prior service credit (cost) arising during the period $ - (1) - - 30 - Amortization of prior service cost (credit) included in income (loss) - (1) - (2) (31) (33) Net change during the period $ - (2) - (2) (1) (33) *Includes settlement (gains) losses recognized in 2020 and 2019. The components of net periodic benefit cost of Millions of Dollars Pension Benefits Other Benefits 2020 2019 2018 2020 2019 2018 U.S. Int’l. U.S. Int’l. U.S. Int’l. Components of Net Periodic Benefit Cost Service cost $ 85 54 79 69 83 81 2 1 1 Interest cost 66 85 79 97 99 107 6 8 8 Expected return on plan assets (85) (145) (74) (138) (114) (155) - - - Amortization of prior service credit - (1) - (2) - (5) (31) (33) (35) Recognized net actuarial loss (gain) 51 22 54 32 53 31 1 (2) (1) Settlements loss (gain) 44 (1) 62 - 196 - - - - Net periodic benefit cost $ 161 14 200 58 317 59 (22) (26) (27) The components of net periodic benefit cost, other expenses” line item on our consolidated income statement. We recognized pension settlement losses of $ 43 62 196 2018 as lump-sum benefit payments from certain service and interest costs for those plans and led During 2020 and 2019, the actuarial losses were primarily related to a decrease in the discount The sale of two ConocoPhillips U.K. subsidiaries significant reduction of future services of active curtailment. assets were updated, the pension benefit obligation $ 43 a decrease in the discount rate from 2.90 1.80 offset by a decrease in the pension benefit obligation from In determining net pension and other postretirement line basis over the average remaining service period For net actuarial gains and losses, we amortize 10 We have multiple nonpension postretirement benefit plans for health and life insurance. are contributory and subject to various cost sharing adjusted annually; the life insurance plans are medical accumulated postretirement benefit 7 2021 that declines to 5 postretirement benefit obligation assumes an ultimate 4 that increases to 5 Plan Assets —We follow a policy of broadly diversifying pension plan assets across asset individual holdings. that are considered appropriate include U.S. equities, income, real estate and private equity investments. the investment program from time to time. 28 securities, 68 3 1 are publicly traded, therefore minimizing liquidity The following is a description of the valuation methodologies been no changes in the methodologies used at ● Fair values of equity securities and government based on quoted market prices in active markets ● Fair values of corporate debt securities, agency and securities categorized in Level 2 are estimated prices for similar assets and liabilities in markets that are not active. security, its fair value is calculated by pricing models that benchmark the security securities with actual market prices. value is based on pricing models that use something inputs such as benchmark yields, reported trades and securities are categorized in Level 3 of the fair ● Fair values of investments in common/collective based on the fair value of the underlying assets. ● Fair values of mutual funds are based on quoted shares held. ● Time deposits are valued at cost, which approximates fair ● Cash is valued at cost, which approximates fair categorized in Level 2 are valued using observable cash balances held in the form of short-term are categorized as Level 2. ● Fair values of exchange-traded derivatives classified For other derivatives classified in Level 2, the values with market input parameters from third-party ● Fair values of insurance contracts are valued at the by the insurance company to the plans’ participants. ● Fair values of real estate investments are valued methods that include reference to third-party sources ● A portion of U.S. pension plan assets is held as contract, which is calculated as the market value accumulated benefit obligation covered by the Level 3 in the fair value hierarchy as the fair value prices, recently executed transactions, and obligations. $ 94 233 139 benefit obligation covered by the contract. annuity contract was valued at $ 95 235 140 million for the accumulated benefit obligation not available for meeting general pension benefit contributions are required and no new benefits contract. The fair values of our pension plan assets at Millions of Dollars U.S. International Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total 2020 Equity securities U.S. $ - 3 5 8 - - - - International 99 - - 99 - - - - Mutual funds 72 - - 72 235 734 - 969 Debt securities Corporate - 1 - 1 - - - - Mutual funds - - - - 455 - - 455 Cash and cash equivalents - - - - 74 - - 74 Derivatives - - - - 6 - - 6 Real estate - - - - - - 142 142 Total in fair value hierarchy $ 171 4 5 180 770 734 142 1,646 Investments measured at net asset value* Equity securities Common/collective trusts $ 678 2,962 Debt securities Common/collective trusts 730 67 Cash and cash equivalents 8 - Real estate 79 112 Total** $ 171 4 5 1,675 770 734 142 4,787 **Excludes the participating interest in the insurance annuity contract with a net 94 7 The fair values of our pension plan assets at Millions of Dollars U.S. International Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total 2019 Equity securities U.S. $ 94 - 7 101 435 - - 435 International 98 - - 98 266 - - 266 Mutual funds 93 - - 93 245 267 - 512 Debt securities Government - - - - 1,412 - - 1,412 Corporate - 2 - 2 - - - - Mutual funds - - - - 392 - - 392 Cash and cash equivalents - - - - 98 - - 98 Derivatives - - - - 11 - - 11 Real estate - - - - - - 132 132 Total in fair value hierarchy $ 285 2 7 294 2,859 267 132 3,258 Investments measured at net asset value* Equity securities Common/collective trusts $ 457 167 Debt securities Common/collective trusts 637 760 Cash and cash equivalents 25 - Real estate 83 112 Total** $ 285 2 7 1,496 2,859 267 132 4,297 **Excludes the participating interest in the insurance annuity contract with a 95 9 Level 3 activity was not material for all Our funding policy for U.S. plans is to contribute Income Security Act of 1974 and the Internal plans are dependent upon local laws and tax regulations. 265 million to our domestic qualified and nonqualified 75 our international qualified and nonqualified The following benefit payments, which are exclusive and which reflect expected future service, as appropriate, Millions of Dollars Pension Other Benefits Benefits U.S. Int’l. 2021 $ 532 147 25 2022 289 151 21 2023 248 156 18 2024 232 162 16 2025 215 166 14 2026–2030 845 897 53 Severance Accrual The following table summarizes our severance accrual Millions of Dollars 2020 2019 2018 Balance at January 1 $ 23 48 53 Accruals 14 (1) 70 Benefit payments (13) (24) (73) Foreign currency translation adjustments - - (2) Balance at December 31 $ 24 23 48 Of the remaining balance at December 31, 2020, 8 Defined Contribution Plans Most U.S. employees are eligible to participate deposit up to 75 approximately 17 1 their eligible pay receive a 6 contribution of up to 6 to opt out of Title II are eligible to receive a Company Retirement 6 pay into their CPSP. three years 100 CRC. 62 2020, $ 82 82 We have several defined contribution plans for our international employees, each eligibility depending on location. approximately $ 25 30 31 Share-Based Compensation Plans The 2014 Omnibus Stock and Performance Incentive shareholders in May 2014. 10 -year life, the Plan allows the issuance of 79 common stock for compensation to our employees (i) any shares of common stock available for future stock represented by awards granted under the prior delivery of shares of common stock or which result company shall be available for awards under the plans. 79 40 common stock are available for incentive stock of our Board of Directors is authorized to determine granted. performance share units to employees and non-employee success and profitability. Total share-based compensation expense is measured using the grant date fair value awards and the settlement date fair value for our compensation expense over the shorter of the service award); or the period beginning at the start of the eligible for retirement, but not less than six months, award to not be subject to forfeiture. vesting (i.e., a waiver of the remaining period of service employees at the time of their retirement. award vest at different times) while some of our awards We recognize expense on a straight-line basis over the service period for the entire was granted with ratable or cliff vesting. Compensation Expense —Total share-based compensation expense recognized in net income (loss) and the associated tax benefit for the years ended Millions of Dollars 2020 2019 2018 Compensation cost $ 159 274 265 Tax benefit 40 71 64 Stock Options — Stock options granted under the provisions of the Plan and prior plans permit purchase of our common stock at exercise prices equivalent to the average fair market value of ConocoPhillips common stock on the date the options were granted. The options have terms of 10 years and generally vest ratably, with one- third of the options awarded vesting and becoming exercisable on each anniversary date following the date of grant. Options awarded to certain employees already eligible for retirement vest within six months of the grant date, but those options do not become exercisable until the end of the normal vesting period. Beginning in 2018, stock option grants were discontinued and replaced with three-year, time-vested restricted stock units which generally will be cash-settled The following summarizes our stock option activity Millions of Dollars Weighted-Average Aggregate Options Exercise Price Intrinsic Value Outstanding at December 31, 2019 18,040,197 $ 54.11 $ 206 Exercised (1,111,805) 38.80 23 Forfeited (5,867) 49.76 Expired or cancelled - Outstanding at December 31, 2020 16,922,525 $ 55.12 $ 22 Vested at December 31, 2020 16,922,525 $ 55.12 $ 22 Exercisable at December 31, 2020 16,922,525 $ 55.12 $ 22 The weighted-average remaining contractual term options at December 31, 2020, were all 3.66 39 million in 2019 and $ 94 During 2020, we received $ 43 9 options. compensation cost to be recorded. Stock Unit Program— Generally, restricted stock units are granted annually under the provisions of the Plan and vest in an aggregate installment on the third anniversary of the grant date. In addition, restricted stock units granted under the Plan for a variable long-term incentive program vest ratably in three equal annual installments beginning on the first anniversary of the grant date. Restricted stock units are also granted ad hoc to attract or retain key personnel, and the terms and conditions under which these restricted stock units vest vary by award . Stock-Settled Upon vesting, these restricted stock units are settled by issuing one share of ConocoPhillips common stock per unit. Units awarded to retirement eligible employees vest six months from the grant date; however, those units are not issued as common stock until the earlier of separation from the company or the end of the regularly scheduled vesting period. Until issued as stock, most recipients of the restricted stock units receive a cash payment of a dividend equivalent that is charged to retained earnings. Executive recipients receive an accrued reinvested dividend equivalent, subject to the terms and conditions of the award, that is charged to retained earnings. The grant date fair market value of these restricted stock units is deemed equal to the average ConocoPhillips stock price on the grant date. The grant date fair market value of units that do not receive a dividend equivalent while unvested is deemed equal to the average ConocoPhillips stock price on the grant date, less the net present value of the dividends that will not be received . The following summarizes our stock-settled stock Weighted-Average Millions of Dollars Stock Units Grant Date Fair Value Total Fair Value Outstanding at December 31, 2019 6,223,046 $ 55.99 Granted 2,890,840 57.40 Forfeited (127,181) 55.84 Issued (2,554,720) 50.16 $ 143 Outstanding at December 31, 2020 6,431,985 $ 58.94 Not Vested at December 31, 2020 4,230,413 59.01 At December 31, 2020, was $ 101 1.71 being 2.14 2018 was $ 67.77 52.45 , respectively. $ 225 154 Cash-Settled Cash settled executive restricted stock units granted in 2018 and 2019 replaced the stock option program. These restricted stock units, subject to elections to defer, will be settled in cash equal to the fair market value of a share of ConocoPhillips common stock per unit on the settlement date and are classified as liabilities on the balance sheet. Units awarded to retirement eligible employees vest six months from the grant date; however, those units are not settled until the earlier of separation from the company or the end of the regularly scheduled vesting period. Compensation expense is initially measured using the average fair market value of ConocoPhillips common stock and is subsequently adjusted, based on changes in the ConocoPhillips stock price through the end of each subsequent reporting period, through the settlement date. Recipients receive an accrued reinvested dividend equivalent that is charged to compensation expense. The accrued reinvested dividend is paid at the time of settlement, subject to the terms and conditions of the award. Beginning with executive restricted stock units granted in 2020 awards will be settled in stock. The following summarizes our cash-settled stock Weighted-Average Millions of Dollars Stock Units Grant Date Fair Value Total Fair Value Outstanding at December 31, 2019 596,991 $ 64.54 Granted 24,437 41.59 Forfeited (5,622) 40.01 Issued (1,191) 40.20 $ - Outstanding at December 31, 2020 614,615 $ 39.95 Not Vested at December 31, 2020 121,696 39.95 At December 31, 2020, was $ 1 1 1.12 were $ 68.20 53.68 , respectively. 6 million and $ 1 Performance Share Program —Under the Plan, we also annually grant restricted (PSUs) to senior management. performance period). ConocoPhillips common stock and is subsequently price through the end of each subsequent reporting the settlement date for cash-settled awards. Stock-Settled For performance periods beginning before 2009, PSUs do not vest until the employee becomes eligible for retirement by reaching age 55 with five years of service, and restrictions do not lapse until the employee separates from the company. With respect to awards for performance periods beginning in 2009 through 2012, PSUs do not vest until the earlier of the date the employee becomes eligible for retirement by reaching age 55 with five years of service or five years after the grant date of the award, and restrictions do not lapse until the earlier of the employee’s separation from the company or five years after the grant date (although recipients can elect to defer the lapsing of restrictions until separation). We recognize compensation expense for these awards beginning on the grant date and ending on the date the PSUs are scheduled to vest. Since these awards are authorized three years prior to the grant date, for employees eligible for retirement by or shortly after the grant date, we recognize compensation expense over the period beginning on the date of authorization and ending on the date of grant. Until issued as stock, recipients of the PSUs receive a quarterly cash payment of a dividend equivalent that is charged to retained earnings. Beginning in 2013, PSUs authorized for future grants will vest, absent employee election to defer, upon settlement following the conclusion of the three-year performance period. We recognize compensation expense over the period beginning on the date of authorization and ending on the conclusion of the performance period. PSUs are settled by issuing one share of ConocoPhillips common stock per unit. The following summarizes our stock-settled Performance December 31, 2020: Weighted-Average Millions of Dollars Stock Units Grant Date Fair Value Total Fair Value Outstanding at December 31, 2019 2,024,824 $ 50.55 Granted 26,244 58.61 Forfeited - Issued (314,340) 51.15 $ 13 Outstanding at December 31, 2020 1,736,728 $ 50.56 Not Vested at December 31, 2020 3,191 $ 48.61 At December 31, 2020, performance share awards was zero . during 2019 and 2018 was $ 68.90 53.28 , respectively. during 2019 and 2018 was $ 25 29 Cash-Settled In connection with and immediately following the new PSUs, subject to a shortened performance employee election to defer, on the earlier of five years after employee becomes eligible for retirement. date, we recognize compensation expense the date of grant. the date the PSUs are scheduled to vest. share of ConocoPhillips common stock per unit the balance sheet. dividend equivalent that is charged to compensation expense. Beginning in 2013, PSUs authorized for future grants three-year performance period. authorization and ending at the conclusion of to the fair market value of a share of ConocoPhillips classified as liabilities on the balance sheet. performance period, recipients of the PSUs do but after the performance period ends, until quarterly cash payment of a dividend equivalent period beginning in 2018, recipients of the PSUs charged to compensation expense. the terms and conditions of the award. The following summarizes our cash-settled Performance December 31, 2020: Weighted-Average Millions of Dollars Stock Units Grant Date Fair Value Total Fair Value Outstanding at December 31, 2019 609,274 $ 64.54 Granted 1,491,098 58.61 Forfeited - Settled (1,975,843) 58.54 $ 116 Outstanding at December 31, 2020 124,529 $ 39.95 At December 31, 2020, all outstanding cash-settled no remaining compensation cost to be recorded. granted during 2019 and 2018 was $ 68.90 53.28 , respectively. performance share awards settled during 2019 171 22 From inception of the Performance Share Program conclusion of performance periods. Beginning in February 2014, initial target PSU awards are issued near the beginning of new performance periods. These initial target PSU awards will terminate at the end of the performance periods and will be settled after the performance periods have ended. Also in 2014, initial target PSU awards were issued for open performance periods that began in prior years. For the open performance period beginning in 2012, the initial target PSU awards terminated at the end of the three-year performance period and were replaced with approved PSU awards. For the open performance period beginning in 2013, the initial target PSU awards terminated at the end of the three-year performance period and were settled after the performance period ended. Other —In addition to the above active programs, stock units that were either issued as part of former members of the company’s Board of Directors or as part of an executive has been discontinued. equivalent. The following summarizes the aggregate activity December 31, 2020: Weighted-Average Millions of Dollars Stock Units Grant Date Fair Value Total Fair Value Outstanding at December 31, 2019 991,908 $ 47.24 Granted 77,824 51.46 Cancelled (1,336) 23.09 Issued (98,297) 45.57 $ 6 Outstanding at December 31, 2020 970,099 $ 47.78 At December 31, 2020, all outstanding restricted was no granted during 2019 and 2018 was $ 63.58 62.01 , respectively. during 2019 and 2018 was $ 11 17

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2020
Income Taxes [Abstract]
Income Taxes	Note 18—Income Taxes Components of income tax expense (benefit) Millions of Dollars 2020 2019 2018 Income Taxes Federal Current $ 3 18 4 Deferred (625) (113) 545 Foreign Current 350 2,545 3,273 Deferred (70) (323) (166) State and local Current (4) 148 108 Deferred (139) (8) (96) $ (485) 2,267 3,668 Deferred income taxes reflect the net tax effect of temporary assets and liabilities for financial reporting purposes of deferred tax liabilities and assets at December Millions of Dollars 2020 2019 Deferred Tax Liabilities PP&E and intangibles $ 7,744 8,660 Inventory 64 35 Other 242 234 Total deferred tax liabilities 8,050 8,929 Deferred Tax Assets Benefit plan accruals 540 542 Asset retirement obligations and accrued environmental 2,262 2,339 Investments in joint ventures 1,653 1,722 Other financial accruals and deferrals 907 777 Loss and credit carryforwards 8,904 8,968 Other 365 345 Total deferred tax assets 14,631 14,693 Less: valuation allowance (9,965) (10,214) Total deferred tax assets net of valuation allowance 4,666 4,479 Net deferred tax liabilities $ 3,384 4,450 At December 31, 2020, noncurrent assets and liabilities 363 million and $ 3,747 of $ 184 million and $ 4,634 At December 31, 2020, foreign tax credit carryforwards of $ 7 carryforwards of $ 1.9 expire in 2021. The following table shows a reconciliation for for 2020, 2019 and 2018: Millions of Dollars 2020 2019 2018 Balance at January 1 $ 10,214 3,040 1,254 Charged to expense (benefit) 460 (225) (26) Other* (709) 7,399 1,812 Balance at December 31 $ 9,965 10,214 3,040 *Represents changes due to originating deferred tax asset that have no impact to our effective effect of translating foreign financial statements. presentation, with no impacts to beginning and ending balances. Valuation than not, be realized. substantially all U.S. foreign tax credit carryforwards various jurisdictions. capital losses in Australia and to the fair value not expected to be realized. Other movements are attributes. strategies, offsets to reversing deferred tax liabilities. On December 2, 2019, the Internal Revenue Service Tax Cuts and Jobs Act. recognized $ 151 6,642 foreign tax credit carryovers where recognition still makes their realization unlikely and therefore allowance. At December 31, 2020, unremitted income subsidiaries and foreign corporate joint ventures 3,982 have not been provided on this amount, as of income taxes. payable on this income if distributed is approximately 199 The following table shows a reconciliation 2019 and 2018: Millions of Dollars 2020 2019 2018 Balance at January 1 $ 1,177 1,081 882 Additions based on tax positions related to the current 6 9 268 Additions for tax positions of prior years 67 120 43 Reductions for tax positions of prior years (34) (22) (73) Settlements (9) (9) (35) Lapse of statute (1) (2) (4) Balance at December 31 $ 1,206 1,177 1,081 Included in the balance of unrecognized tax benefits 1,128 $ 1,100 1,081 balance of the unrecognized tax benefits increased settlement. The balance of the unrecognized tax distributions from certain foreign subsidiaries. information on the PDVSA settlement. At December 31, 2020, 2019 and 2018, accrued liabilities 46 $ 42 45 reduction to earnings of $ 4 3 earnings of $ 4 We file tax returns in the U.S. federal jurisdiction and in many foreign and state jurisdictions. jurisdictions are generally complete as follows: Issues in dispute for audited years and audits for completion in the many jurisdictions in which unrecognized tax benefits can be expected to fluctuate changes could be significant when compared change is not estimable. The amounts of U.S. and foreign income (loss) statutory rate to the provision for income taxes, Millions of Dollars Percent of Pre-Tax Income (Loss) 2020 2019 2018 2020 2019 2018 Income (loss) before income taxes United States $ (3,587) 4,704 2,867 114.2 % 49.4 28.7 Foreign 447 4,820 7,106 (14.2) 50.6 71.3 $ (3,140) 9,524 9,973 100.0 % 100.0 100.0 Federal statutory income tax $ (659) 2,000 2,095 21.0 % 21.0 21.0 Non-U.S. effective tax rates 194 1,399 1,766 (6.2) 14.7 17.7 Tax Legislation - - (10) - - (0.1) Australia disposition (349) - - 11.1 - - U.K. disposition - (732) (150) - (7.7) (1.5) Recovery of outside basis (22) (77) (21) 0.7 (0.8) (0.2) Adjustment to tax reserves 18 9 (4) (0.6) 0.1 - Adjustment to valuation allowance 460 (225) (26) (14.6) (2.4) (0.3) State income tax (112) 123 135 3.6 1.3 1.4 Malaysia Deepwater Incentive - (164) - - (1.7) - Enhanced oil recovery credit (6) (27) (99) 0.2 (0.3) (1.0) Other (9) (39) (18) 0.3 (0.4) (0.2) $ (485) 2,267 3,668 15.5 % 23.8 36.8 Our effective tax rate for 2020 was impacted by the disposition valuation allowance related to the fair value measurement Australia-West disposition generated a before-tax gain of $ 587 10 million and resulted in the de-recognition of deferred 92 disposition also generated an Australia capital 313 valuation allowance. valuation allowance was increased by $ 178 Our effective tax rate for 2019 was favorably impacted disposition generated a before-tax gain of more than 1.7 335 million. The disposition generated a U.S. capital 2.1 tax benefit of approximately $ 285 asset fully offset with a valuation information on the disposition. During the third quarter of 2019, we received final deepwater tax credits. As a result, we recorded 164 The decrease in the effective tax rate for 2018 was primarily the U.K. and our overall income position, partially jurisdictions. The subsidiary held 16.5 24 disposition generated a before-tax gain of $ 715 Acquisitions and Dispositions, for additional As a result of the COVID-19 pandemic and the operate, including Australia, Canada, Norway and the second quarter, Norway enacted legislation to accelerate immediate monetization of tax losses. our net deferred tax liability of $ 120 $ 124

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	12 Months Ended
	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income	Note 19—Accumulated Other Comprehensive Loss Accumulated other comprehensive loss in the Millions of Dollars Defined Benefit Plans Net Unrealized Loss on Securities Foreign Currency Translation Accumulated Other Comprehensive Loss December 31, 2017 $ (400) (58) (5,060) (5,518) Other comprehensive income (loss) 39 - (642) (603) Cumulative effect of adopting ASU No. 2016-01* - 58 - 58 December 31, 2018 (361) - (5,702) (6,063) Other comprehensive income 51 - 695 746 Cumulative effect of adopting ASU No. 2018-02** (40) - - (40) December 31, 2019 (350) - (5,007) (5,357) Other comprehensive income (loss) (75) 2 212 139 December 31, 2020 $ (425) 2 (4,795) (5,218) 1, 2019. During 2019, we recognized $ 483 of our sale of two ConocoPhillips U.K. subsidiaries. Note 4—Asset Acquisitions and Dispositions. The following table summarizes reclassifications ended December 31: Millions of Dollars 2020 2019 Defined Benefit Plans $ 72 88 Above amounts are included in the computation of net periodic benefit cost are presented net of tax expense of: $ 13 23 See Note 17—Employee Benefit Plans, for additional information.

Cash Flow Information

Cash Flow Information	12 Months Ended
	Dec. 31, 2020
Cash Flow Information [Abstract]
Cash Flow Information	Note 20—Cash Flow Information Millions of Dollars 2020 2019 2018 Noncash Investing Activities Increase (decrease) in PP&E related to an increase retirement obligations $ (116) 205 395 Increase (decrease) in assets and liabilities exchange* Accounts receivable - - (44) Inventories - - 42 Investments and long-term receivables - - 15 PP&E - - 1,907 Other long-term assets - - (9) Accounts payable - - 7 Accrued income and other taxes - - 40 Cash Payments Interest $ 785 810 772 Income taxes 905 2,905 2,976 Net Sales (Purchases) of Investments Short-term investments purchased $ (12,435) (4,902) (1,953) Short-term investments sold 12,015 2,138 3,573 Investments and long-term receivables purchased (325) (146) - Investments and long-term receivables sold 87 - - $ (658) (2,910) 1,620 *See Note 4—Asset Acquisitions and Dispositions. The following items are included in the “Cash cash flows. We collected $ 330 430 agreement related to an award issued by the ICC Tribunal in 2018. see Note 12—Contingencies and Commitments. 262 installment payments related to an agreement In 2019, we made a $ 324 our domestic qualified pension plan of $ 120

Other Financial Information

Other Financial Information	12 Months Ended
	Dec. 31, 2020
Other Financial Information [Abstract]
Other Financial Information	Note 21—Other Financial Information Millions of Dollars 2020 2019 2018 Interest and Debt Expense Incurred Debt $ 788 799 838 Other 73 36 67 861 835 905 Capitalized (55) (57) (170) Expensed $ 806 778 735 Other Income (Loss) Interest income $ 100 166 97 Unrealized gains (losses) on Cenovus Energy common shares* (855) 649 (437) Other, net 246 543 513 $ (509) 1,358 173 *See Note 6—Investment in Cenovus Energy, for additional information. Research and Development Expenditures —expensed $ 75 82 78 Shipping and Handling Costs $ 857 1,008 1,075 Foreign Currency Transaction (Gains) Losses —after-tax Alaska $ - - - Lower 48 - - - Canada (7) 5 (11) Europe, Middle East and North Africa (15) - (26) Asia Pacific (11) 31 3 Other International 2 1 - Corporate and Other (31) 21 21 $ (62) 58 (13) Millions of Dollars 2020 2019 Properties, Plants and Equipment Proved properties $ 94,312 88,284 * Unproved properties 4,141 3,980 * Other 3,653 5,482 Gross properties, plants and equipment 102,106 97,746 Less: Accumulated depreciation, depletion and amortization (62,213) (55,477) * Net properties, plants and equipment $ 39,893 42,269 *Excludes assets classified as held for sale at December 31, — Asset Acquisitions and Dispositions, for additional information.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2020
Related Party Transactions [Abstract]
Related Party Transactions	Note 22—Related Party Transactions Our related parties primarily include equity method For disclosures on trusts for the benefit of employees, — Employee Benefit Plans. Significant transactions with our equity affiliates Millions of Dollars 2020 2019 2018 Operating revenues and other income $ 79 89 98 Purchases - 38 98 Operating expenses and selling, general and administrative 63 65 60 Net interest income* (5) (13) (14) *We paid interest to, or received interest from,

Sales and Other Operating Reven

Sales and Other Operating Revenues	12 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer	Note 23—Sales and Other Operating Revenues Revenue from Contracts with Customers The following table provides further disaggregation Millions of Dollars 2020 2019 2018 Revenue from contracts with customers $ 13,662 26,106 28,098 Revenue from contracts outside the scope of ASC Physical contracts meeting the definition of a derivative 5,177 6,558 8,218 Financial derivative contracts (55) (97) 101 Consolidated sales and other operating revenues $ 18,784 32,567 36,417 Revenues from contracts outside the scope of ASC market prices which qualify as derivatives accounted and for which we have not elected NPNS. for recognition of revenue from these contracts disaggregation of revenues is provided in conjunction Information: Millions of Dollars 2020 2019 2018 Revenue from Outside the Scope of ASC Topic 606 by Segment Lower 48 $ 3,966 4,989 6,358 Canada 727 691 629 Europe, Middle East and North Africa 484 878 1,231 Physical contracts meeting the definition of a derivative $ 5,177 6,558 8,218 Millions of Dollars 2020 2019 2018 Revenue from Outside the Scope of ASC Topic 606 by Product Crude oil $ 395 804 1,112 Natural gas 4,339 5,313 6,734 Other 443 441 372 Physical contracts meeting the definition of a derivative $ 5,177 6,558 8,218 Practical Expedients Typically, cases may extend longer, which may be out to the end of We have long-term commodity sales contracts which use prevailing market prices at the time of delivery, and under these contracts, the market- based variable consideration for each performance obligation (i.e., delivery of commodity) is allocated to each wholly unsatisfied performance obligation within the contract. we have applied the practical expedient allowed in ASC Topic 606 and do not disclose the aggregate amount of the transaction price allocated to performance obligations or when we expect to recognize revenues that are unsatisfied (or partially unsatisfied) as of the end of the reporting period. Receivables and Contract Liabilities Receivables from Contracts with Customers At December 31, 2020, the “Accounts and trade receivables of $ 1,827 2,372 contracts with customers within the scope of ASC Topic 606. We typically receive payment within 30 days or less (depending on the terms of the invoice) once delivery is made. contracts at market prices for which we do not under ASC Topic 815. receivables associated with gas sold under contracts receivables where NPNS has been elected. Contract Liabilities from Contracts with Customers We have entered into contractual arrangements where we license proprietary technology to customers related to the optimization process for operating LNG plants. The agreements typically provide for negotiated payments to be made at stated milestones. The payments are not directly related to our performance under the contract and are recorded as deferred revenue to be recognized as revenue when the customer can utilize and benefit from their right to use the license. Payments are received in installments over the construction period. Millions of Dollars Contract Liabilities At December 31, 2019 $ 80 Contractual payments received 17 At December 31, 2020 $ 97 Amounts Recognized in the Consolidated Current liabilities $ 56 Noncurrent liabilities 41 $ 97 We expect to recognize the contract liabilities as of December 31, 2020, as revenue during 2021 and 2022. There was no revenue recognized during the

Segment Disclosures and Related

Segment Disclosures and Related Information	12 Months Ended
	Dec. 31, 2020
Segment Disclosures and Related Information [Abstract]
Segment Disclosures and Related Information	Note 24—Segment Disclosures and Related Information We explore for, produce, transport and market crude oil, bitumen, natural gas, LNG and NGLs on basis. six region: Alaska; Lower 48; Canada; Europe, International. Corporate and Other represents income and costs most interest expense, premiums on early retirement activities, including licensing revenues. investments. We evaluate performance and allocate resources based on net income (loss) attributable Segment accounting policies are the same as those prices that approximate market. Effective with the third quarter of 2020, we restructured our organization. Europe and North Africa segment. Middle East and North Africa segment. performance metrics presented within our results Analysis of Results by Operating Segment Millions of Dollars 2020 2019 2018 Sales and Other Operating Revenues Alaska $ 3,408 5,483 5,740 Intersegment eliminations (11) - - Alaska 3,397 5,483 5,740 Lower 48 9,872 15,514 17,029 Intersegment eliminations (51) (46) (40) Lower 48 9,821 15,468 16,989 Canada 1,666 2,910 3,184 Intersegment eliminations (405) (1,141) (1,160) Canada 1,261 1,769 2,024 Europe, Middle East and North Africa 1,919 5,101 6,635 Intersegment eliminations (2) - - Europe, Middle East and North Africa 1,917 5,101 6,635 Asia Pacific 2,363 4,525 4,861 Other International 7 - - Corporate and Other 18 221 168 Consolidated sales and other operating revenues $ 18,784 32,567 36,417 The market for our products is large and diverse, therefore, dependent upon any single customer. Millions of Dollars 2020 2019 2018 Depreciation, Depletion, Amortization and Impairments Alaska $ 996 805 760 Lower 48 3,358 3,224 2,370 Canada 342 232 324 Europe, Middle East and North Africa 775 887 1,041 Asia Pacific 809 1,285 1,382 Other International - - - Corporate and Other 54 62 106 Consolidated depreciation, depletion, amortization $ 6,334 6,495 5,983 Equity in Earnings of Affiliates Alaska $ (7) 7 6 Lower 48 (11) (159) 1 Canada - - - Europe, Middle East and North Africa 311 470 744 Asia Pacific 137 461 323 Other International 2 - - Corporate and Other - - - Consolidated equity in earnings of affiliates $ 432 779 1,074 Income Tax Provision (Benefit) Alaska $ (256) 472 376 Lower 48 (378) 137 474 Canada (185) (43) (96) Europe, Middle East and North Africa 136 1,425 2,259 Asia Pacific 294 501 728 Other International (20) 8 30 Corporate and Other (76) (233) (103) Consolidated income tax provision (benefit) $ (485) 2,267 3,668 Net Income (Loss) Attributable to ConocoPhillips Alaska $ (719) 1,520 1,814 Lower 48 (1,122) 436 1,747 Canada (326) 279 63 Europe, Middle East and North Africa 448 3,170 2,594 Asia Pacific 962 1,483 1,342 Other International (64) 263 364 Corporate and Other (1,880) 38 (1,667) Consolidated net income (loss) attributable $ (2,701) 7,189 6,257 Millions of Dollars 2020 2019 2018 Investments in and Advances to Affiliates Alaska $ 62 83 86 Lower 48 25 35 378 Canada - - - Europe, Middle East and North Africa 918 1,070 1,311 Asia Pacific 6,705 7,265 7,565 Other International - - - Corporate and Other - - - Consolidated investments in and advances to affiliates $ 7,710 8,453 9,340 Total Assets Alaska $ 14,623 15,453 14,648 Lower 48 11,932 14,425 14,888 Canada 6,863 6,350 5,748 Europe, Middle East and North Africa 8,756 9,269 11,276 Asia Pacific 11,231 13,568 14,758 Other International 226 285 89 Corporate and Other 8,987 11,164 8,573 Consolidated total assets $ 62,618 70,514 69,980 Capital Expenditures and Investments Alaska $ 1,038 1,513 1,298 Lower 48 1,881 3,394 3,184 Canada 651 368 477 Europe, Middle East and North Africa 600 708 877 Asia Pacific 384 584 718 Other International 121 8 6 Corporate and Other 40 61 190 Consolidated capital expenditures and investments $ 4,715 6,636 6,750 Interest Income and Expense Interest income Alaska $ - - - Lower 48 - - - Canada - - - Europe, Middle East and North Africa 5 11 12 Asia Pacific 7 6 5 Other International - - - Corporate and Other 88 149 80 Interest and debt expense Corporate and Other $ 806 778 735 Sales and Other Operating Revenues by Crude oil $ 9,736 18,482 19,571 Natural gas 6,427 8,715 10,720 Natural gas liquids 528 814 1,114 Other* 2,093 4,556 5,012 Consolidated sales and other operating revenues $ 18,784 32,567 36,417 *Includes LNG and bitumen. Geographic Information Millions of Dollars Sales and Other Operating Revenues (1) Long-Lived Assets (2) 2020 2019 2018 2020 2019 2018 United States $ 13,230 21,159 22,740 24,034 26,566 26,838 Australia and Timor-Leste 605 1,647 1,798 6,676 7,228 9,301 Canada 1,261 1,769 2,024 6,385 5,769 5,333 China 460 772 836 1,491 1,447 1,380 Indonesia 689 875 886 464 605 669 Libya 155 1,103 1,142 670 668 679 Malaysia 610 1,230 1,346 1,501 1,871 2,327 Norway 1,426 2,349 2,886 5,294 5,258 5,582 United Kingdom 336 1,649 2,606 1 2 1,583 Other foreign countries 12 14 153 1,087 1,308 1,346 Worldwide consolidated $ 18,784 32,567 36,417 47,603 50,722 55,038 (1) Sales and other operating revenues are attributable to countries based on the location of (2) Defined as net PP&E plus equity investments and advances

New Accounting Standards

New Accounting Standards	12 Months Ended
	Dec. 31, 2020
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Standards [Text Block]	Note 2—Changes in Accounting Principles We adopted the provisions of FASB ASU No. 2016-13, “Measurement of Credit Losses on Financial Instruments,” (ASC Topic 326) and its amendments, beginning January 1, 2020. This ASU, as amended, sets forth the current expected credit loss model, a new forward-looking impairment model for certain financial instruments measured at amortized cost basis based on expected losses rather than incurred losses. This ASU, as amended, which primarily applies to our accounts receivable, also requires credit losses related to available- for-sale debt securities to be recorded through an allowance for credit losses. The adoption of this ASU did not have a material impact to our financial statements. The majority of our receivables are due within 30 days or less. We monitor the credit quality of our counterparties through review of collections, credit ratings, and other analyses. We develop our estimated allowance for credit losses primarily using an aging method and analyses of historical loss rates as well as consideration of current and future conditions that could impact our counterparties’ credit quality and liquidity.

Accounting Policies (Policies)

Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Consolidation Principles and Investments	Consolidation Principles and Investments —Our consolidated financial statements of majority-owned, controlled subsidiaries beneficiary. ability to exert significant influence over the affiliates’ have the ability to exert significant influence, investment does not have a readily determinable cost minus impairment, plus or minus observable similar investment of the same issuer. gas plants and terminals are consolidated on a proportionate generally carried at cost. We manage our operations through six operating segments, defined by geographic 48; Canada; information, see Note 24—Segment Disclosures The unrealized (gain) loss on investment in Cenovus cash flows, previously reflected on the line item has been reclassified in the comparative periods
Foreign Currency Translation	Foreign Currency Translation —Adjustments resulting from the process of translating functional currency financial statements into comprehensive loss in common stockholders’ equity. included in current earnings. currency.
Use of Estimates	Use of Estimates —The preparation of financial statements generally accepted in the U.S. requires management reported amounts of assets, liabilities, liabilities.
Revenue Recognition	Revenue Recognition —Revenues associated with the sales of crude NGLs and other items are recognized at the point In evaluating when a customer has control of the title and physical delivery has occurred, whether ownership, and whether the customer has accepted are typically sold at prevailing market prices. deliveries (performance obligations) in the efforts to transfer control of current period deliveries to the expect to be entitled to in exchange for the related Payment is typically due within 30 days or less. Revenues associated with transactions commonly of inventory with the same counterparty are entered and reported net (i.e., on the same income statement
Cash Equivalents	Cash Equivalents —Cash equivalents are highly liquid, convertible to known amounts of cash and have purchase.
Investment, Policy	Short-Term Investments —Short-term investments include investments marketable securities (commercial paper and government accrued interest and have original maturities remaining maturities are within one year. for sale debt securities which are carried at fair investments when they have remaining maturities Long-Term Investments in Debt Securities —Long-term investments in debt securities financial instruments classified as available for sale one year as of the balance sheet date. and long-term receivables” line of our consolidated
Inventories	Inventories —We have several valuation methods for our various types of inventories use the following methods for each type of inventory. are recorded at cost using the LIFO basis. the aggregate. permanent adjustments to the LIFO cost basis. current revenues. product to its existing condition and location, development costs. well equipment, are valued using various methods, FIFO method, consistent with industry practice.
Fair Value Measurements	Fair Value Measurements —Assets and liabilities measured at fair value within the fair value hierarchy are categorized into observability of the inputs employed in the measurement. markets for identical assets or liabilities. included within Level 1 for the asset or liability, either directly or indirectly inputs. to observable related market data or our assumptions
Derivative Instruments	Derivative Instruments —Derivative instruments are recorded on the balance right of offset exists and certain other criteria are met, counterparty are netted on the balance sheet and the derivative assets and derivative liabilities, Recognition and classification of the gain or loss fair value depends on the purpose for issuing or not accounted for as hedges are recognized immediately
Oil and Gas Exploration and Development	Oil and Gas Exploration and Development —Oil and gas exploration and development accounted for using the successful efforts method of Property Acquisition Costs —Oil and gas leasehold acquisition costs are the balance sheet caption PP&E. experience and management’s judgment. to be classified as proved, the associated leasehold Exploratory Costs —Geological and geophysical costs and the undeveloped properties are expensed as incurred. “suspended,” on the balance sheet pending further reserves have been found. are expensed as dry holes. gas, the well costs remain capitalized on the balance reserves and the economic and operating viability exploratory discoveries, it is not unusual to sheet for several years while we perform additional potential oil and gas field or while we seek government or seek environmental permitting. projects are moved into the development phase, reserves. Management reviews suspended well balances quarterly, continuously monitors additional appraisal drilling and seismic work, when it judges the potential field does not Suspended Wells and Exploration Expenses, for additional information on suspended Development Costs —Costs incurred to drill and equip development development wells, are capitalized. Depletion and Amortization —Leasehold costs of producing properties of-production method based on estimated proved development costs is based on the unit-of-production and gas reserves. ■ Capitalized Interest —Interest from external borrowings is expected construction period of one year or longer. underlying asset and is amortized over the useful assets. ■ Depreciation and Amortization —Depreciation and amortization of PP&E properties and SAGD facilities and certain pipeline declining utilization pattern), are determined by amortization of all other PP&E are determined group-straight-line method (for those individual ■ Impairment of Properties, Plants and Equipment —PP&E used in operations are assessed for impairment whenever changes in facts and circumstances the future cash flows expected to be generated amount of an asset may not be recovered, a recoverability assumptions such as for prices, volumes and future undiscounted cash flows before income-taxes is carrying value is written down to estimated fair which the determination of the impairment purposes at the lowest level for which there are cash flows of other groups of assets—generally usually is a lack of quoted market prices for determined based on the present values of expected believed to be consistent with those used by principal operating cash flow validated with historical lived assets committed by management for disposal amortized cost or fair value, less cost to sell, if available, or present value of expected future The expected future cash flows used for impairment on estimated future production volumes, prices review.
Capitalized Interest	Capitalized Interest —Interest from external borrowings is expected construction period of one year or longer. underlying asset and is amortized over the useful assets.
Depreciation and Amortization	Depreciation and Amortization —Depreciation and amortization of PP&E properties and SAGD facilities and certain pipeline declining utilization pattern), are determined by amortization of all other PP&E are determined group-straight-line method (for those individual
Impairment of Properties, Plants and Equipment	Impairment of Properties, Plants and Equipment —PP&E used in operations are assessed for impairment whenever changes in facts and circumstances the future cash flows expected to be generated amount of an asset may not be recovered, a recoverability assumptions such as for prices, volumes and future undiscounted cash flows before income-taxes is carrying value is written down to estimated fair which the determination of the impairment purposes at the lowest level for which there are cash flows of other groups of assets—generally usually is a lack of quoted market prices for determined based on the present values of expected believed to be consistent with those used by principal operating cash flow validated with historical lived assets committed by management for disposal amortized cost or fair value, less cost to sell, if available, or present value of expected future The expected future cash flows used for impairment on estimated future production volumes, prices review. including any development expenditures necessary probable and possible reserves exist, an appropriate included in the impairment calculation. ■ Impairment of Investments in Nonconsolidated —Investments in nonconsolidated entities assessed for impairment whenever changes in the occurred. value of the investment is written down to fair on quoted market prices, if available, or upon discount rates and prices believed to be consistent market analysis of comparable assets owned by the ■ Maintenance and Repairs —Costs of maintenance and repairs, which are are expensed when incurred. ■ Property Dispositions —When complete units of depreciable property accumulated depreciation are eliminated, of our consolidated income statement. disposed of or retired which do not significantly and salvage value is charged or credited to accumulated ■ Asset Retirement Obligations and Environmental Costs —The fair value of legal obligations to retire and remove long-lived assets are recorded in when the asset is installed at the production location). approach, incorporating assumptions about estimated the use of technologies. carrying amount of the related PP&E. will record an adjustment to both the liability change in its present value, and the capitalized cost related asset. credit to impairment, if the asset had been previously not been previously impaired. Accrued Environmental Costs. Environmental expenditures are expensed or capitalized, Expenditures relating to an existing condition economic benefit, are expensed. undiscounted basis (unless acquired through a business basis) when environmental assessments or cleanups estimated. their receipt is probable and estimable. ■ Guarantees —The fair value of a guarantee is determined guarantee is given. the guarantee. the facts and circumstances surrounding each type indefinite, we reverse the liability when we have or amortize it over an appropriate time time. the guarantee. separate liability if it is reasonably estimable, reverse the fair value liability only when there ■ Share-Based Compensation —We recognize share-based compensation expense over the shorter of the service period (i.e., the stated period of time required start of the service period and ending when an
Impairment of Investments in Nonconsolidated Entities	Impairment of Investments in Nonconsolidated —Investments in nonconsolidated entities assessed for impairment whenever changes in the occurred. value of the investment is written down to fair on quoted market prices, if available, or upon discount rates and prices believed to be consistent market analysis of comparable assets owned by the
Maintenance and Repairs	Maintenance and Repairs —Costs of maintenance and repairs, which are are expensed when incurred.
Property Dispositions	Property Dispositions —When complete units of depreciable property accumulated depreciation are eliminated, of our consolidated income statement. disposed of or retired which do not significantly and salvage value is charged or credited to accumulated
Asset Retirement Obligations and Environmental Costs	Asset Retirement Obligations and Environmental Costs —The fair value of legal obligations to retire and remove long-lived assets are recorded in when the asset is installed at the production location). approach, incorporating assumptions about estimated the use of technologies. carrying amount of the related PP&E. will record an adjustment to both the liability change in its present value, and the capitalized cost related asset. credit to impairment, if the asset had been previously not been previously impaired. Accrued Environmental Costs. Environmental expenditures are expensed or capitalized, Expenditures relating to an existing condition economic benefit, are expensed. undiscounted basis (unless acquired through a business basis) when environmental assessments or cleanups estimated. their receipt is probable and estimable.
Guarantees	Guarantees —The fair value of a guarantee is determined guarantee is given. the guarantee. the facts and circumstances surrounding each type indefinite, we reverse the liability when we have or amortize it over an appropriate time time. the guarantee. separate liability if it is reasonably estimable, reverse the fair value liability only when there
Stock-Based Compensation	Share-Based Compensation —We recognize share-based compensation expense over the shorter of the service period (i.e., the stated period of time required start of the service period and ending when an elected to recognize expense on a straight-line the award was granted with ratable or cliff vesting. ■ Income Taxes —Deferred income taxes are computed using temporary differences between the financial reporting basis except for deferred taxes on income and temporary adjustment considered to be permanently reinvested joint ventures. taxes. related to unrecognized tax benefits are reflected ■ Taxes Collected from Customers and Remitted to Governmental Authorities —Sales and value- added taxes are recorded net. ■ Net Income (Loss) Per Share of Common Stock —Basic net income (loss) per share of common stock is calculated based upon the daily weighted-average year. calculation includes fully vested stock and unit common stock, along with an adjustment to unit awards that are considered participating includes unvested stock, unit or option awards granted unexercised stock options, but only to the extent these under the treasury-stock method. per share, does not assume conversion or exercise Treasury stock is excluded from the daily weighted-average number both calculations.
Income Taxes	Income Taxes —Deferred income taxes are computed using temporary differences between the financial reporting basis except for deferred taxes on income and temporary adjustment considered to be permanently reinvested joint ventures. taxes. related to unrecognized tax benefits are reflected
Taxes Collected from Customers and Remitted to Governmental Authorities	Taxes Collected from Customers and Remitted to Governmental Authorities —Sales and value- added taxes are recorded net.
Net Income (Loss) Per Share of Common Stock	Net Income (Loss) Per Share of Common Stock —Basic net income (loss) per share of common stock is calculated based upon the daily weighted-average year. calculation includes fully vested stock and unit common stock, along with an adjustment to unit awards that are considered participating includes unvested stock, unit or option awards granted unexercised stock options, but only to the extent these under the treasury-stock method. per share, does not assume conversion or exercise Treasury stock is excluded from the daily weighted-average number both calculations.
Shipping and Handling Cost, Policy [Policy Text Block]	Shipping and Handling Costs —We typically incur shipping and handling costs prior to control transferring to the customer and account for these shipping and handling costs in production and operating Transportation costs related to marketing activities are recorded billed to customers are treated as a component of the revenue when the customer obtains control.
New Accounting Pronouncements, Policy [Policy Text Block]	We adopted the provisions of FASB ASU No. 2016-13, “Measurement of Credit Losses on Financial Instruments,” (ASC Topic 326) and its amendments, beginning January 1, 2020. This ASU, as amended, sets forth the current expected credit loss model, a new forward-looking impairment model for certain financial instruments measured at amortized cost basis based on expected losses rather than incurred losses. This ASU, as amended, which primarily applies to our accounts receivable, also requires credit losses related to available- for-sale debt securities to be recorded through an allowance for credit losses. The adoption of this ASU did not have a material impact to our financial statements. The majority of our receivables are due within 30 days or less. We monitor the credit quality of our counterparties through review of collections, credit ratings, and other analyses. We develop our estimated allowance for credit losses primarily using an aging method and analyses of historical loss rates as well as consideration of current and future conditions that could impact our counterparties’ credit quality and liquidity.

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2020
Inventories [Abstract]
Inventories	Note 3—Inventories Inventories at December 31 were: Millions of Dollars 2020 2019 Crude oil and natural gas $ 461 472 Materials and supplies 541 554 $ 1,002 1,026

Investments, Loans and Long-T_2

Investments, Loans and Long-Term Receivables (Tables)	12 Months Ended
	Dec. 31, 2020
Investments, Loans and Long-Term Receivables and Joint Venture Acquisition Obligation [Abstract]
Components of investments, loans and long-term receivables	Note 5—Investments, Loans and Long-Term Receivables Components of investments, loans and long-term Millions of Dollars 2020 2019 Equity investments $ 7,596 8,234 Loans and advances—related parties 114 219 Long-term receivables 137 243 Long-term investments in debt securities 217 133 Other investments 67 77 $ 8,131 8,906
Summarized financial information for equity method investments in affiliated companies	Summarized 100 percent earnings information combined, was as follows: Millions of Dollars 2020 2019 2018 Revenues $ 7,931 11,310 11,654 Income before income taxes 1,843 3,726 3,660 Net income 1,426 3,085 3,244 Summarized 100 percent balance sheet information combined, was as follows: Millions of Dollars 2020 2019 Current assets $ 2,579 3,289 Noncurrent assets 35,257 38,905 Current liabilities 2,110 2,603 Noncurrent liabilities 18,099 22,168

Suspended Wells (Tables)

Suspended Wells (Tables)	12 Months Ended
	Dec. 31, 2020
Suspended Wells [Abstract]
Net changes in suspended exploratory well costs	Note 7—Suspended Wells and Exploration Expenses The following table reflects the net changes in suspended Millions of Dollars 2020 2019 2018 Beginning balance at January 1 $ 1,020 856 853 Additions pending the determination of proved reserves 164 239 140 Reclassifications to proved properties (42) (11) (37) Sales of suspended wells (313) (54) (93) Charged to dry hole expense (147) (10) (7) Ending balance at December 31 $ 682 1,020 * 856 *Includes $ 313 For additional details on suspended wells charged to dry hole expense, see the
Aging of suspended well cost	The following table provides an aging of suspended Millions of Dollars 2020 2019 2018 Exploratory well costs capitalized for a period $ 156 206 145 Exploratory well costs capitalized for a period 526 814 711 Ending balance $ 682 1,020 * 856 Number of projects with exploratory well costs period greater than one year 22 23 24 *Includes $ 313
Aging of Exploratory Well Cost that have been capitalized for more than one year	The following table provides a further aging of than one year since the completion of drilling Millions of Dollars Suspended Since Total 2017–2019 2014–2016 2004–2013 NPRA—Alaska (1) 240 190 50 - Surmont—Canada (1) 120 4 31 85 Narwhal Trend—Alaska (1) 52 52 - - PL782S—Norway (1) 22 22 - - WL4-00—Malaysia (1) 17 17 - - NC 98—Libya (2) 13 - 9 4 Other of $10 million or less each (1)(2) 62 26 19 17 Total $ 526 311 109 106 (1)Additional appraisal wells planned. (2)Appraisal drilling complete; costs being incurred to assess development.

Impairments (Tables)

Impairments (Tables)	12 Months Ended
	Dec. 31, 2020
Impairment Of Long Lived Assets [Abstract]
Impairment Charges By Segment Before Tax	Note 8—Impairments During 2020, 2019 and 2018, we recognized the Millions of Dollars 2020 2019 2018 Alaska $ - - 20 Lower 48 804 402 63 Canada 3 2 9 Europe, Middle East and North Africa 6 1 (79) Asia Pacific - - 14 $ 813 405 27

Asset Retirement Obligations _2

Asset Retirement Obligations and Accrued Environmental Costs (Tables)	12 Months Ended
	Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract]
Asset retirement obligations and accrued environmental costs	Note 9—Asset Retirement Obligations and Accrued Asset retirement obligations and accrued environmental Millions of Dollars 2020 2019 Asset retirement obligations $ 5,573 6,206 Accrued environmental costs 180 171 Total asset retirement obligations and accrued environmental costs 5,753 6,377 Asset retirement obligations and accrued environmental (323) (1,025) Long-term asset retirement obligations and accrued $ 5,430 5,352
Changes in overall asset retirement obligation changed	During 2020 and 2019, our overall ARO changed Millions of Dollars 2020 2019 Balance at January 1 $ 6,206 7,908 Accretion of discount 248 322 New obligations 262 155 Changes in estimates of existing obligations (307) 50 Spending on existing obligations (116) (229) Property dispositions (771) (1,920) Foreign currency translation 51 (80) Balance at December 31 $ 5,573 6,206

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2020
Debt [Abstract]
Long-term debt	Note 10—Debt Long-term debt at December 31 was: Millions of Dollars 2020 2019 9.125 % Debentures due 2021 $ 123 123 2.4 % Notes due 2022 329 329 7.65 % Debentures due 2023 78 78 3.35 % Notes due 2024 426 426 8.2 % Debentures due 2025 134 134 3.35 % Notes due 2025 199 199 6.875 % Debentures due 2026 67 67 4.95 % Notes due 2026 1,250 1,250 7.8 % Debentures due 2027 203 203 7.375 % Debentures due 2029 92 92 7 % Debentures due 2029 200 200 6.95 % Notes due 2029 1,549 1,549 8.125 % Notes due 2030 390 390 7.2 % Notes due 2031 575 575 7.25 % Notes due 2031 500 500 7.4 % Notes due 2031 500 500 5.9 % Notes due 2032 505 505 4.15 % Notes due 2034 246 246 5.95 % Notes due 2036 500 500 5.951 % Notes due 2037 645 645 5.9 % Notes due 2038 600 600 6.5 % Notes due 2039 2,750 2,750 4.3 % Notes due 2044 750 750 5.95 % Notes due 2046 500 500 7.9 % Debentures due 2047 60 60 Floating rate notes due 2022 at 1.12 % – 2.81 % during 2020 and 2.81 % – 3.58 % during 2019 500 500 Marine Terminal Revenue Refunding Bonds due 2031 at 0.1 % – 7.5 % during 1.08 % – 2.45 % during 2019 265 265 Industrial Development Bonds due 2035 at 0.11 % – 7.5 % during 2020 and 1.08 % – 2.45 % during 2019 18 18 Commercial Paper at 0.08 % – 0.23 % during 2020 300 Other 38 17 Debt at face value 14,292 13,971 Finance leases 891 720 Net unamortized premiums, discounts and 186 204 Total debt 15,369 14,895 Short-term debt (619) (105) Long-term debt $ 14,750 14,790

Derivative and Financial Inst_2

Derivative and Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2020
Derivative and Financial Instruments [Abstract]
Balance sheet location and fair value amounts of derivatives	The following table presents the gross fair values line items where they appear on our consolidated Millions of Dollars 2020 2019 Assets Prepaid expenses and other current assets $ 229 288 Other assets 26 34 Liabilities Other accruals 202 283 Other liabilities and deferred credits 18 28 The following table presents the gross fair values collateral, and the line items where they appear Millions of Dollars 2020 2019 Assets Prepaid expenses and other current assets $ 2 1 Liabilities Other accruals 16 20 Other liabilities and deferred credits - 8
Income statement location and gain/loss amounts of derivatives	The gains (losses) from commodity derivatives consolidated income statement were: Millions of Dollars 2020 2019 2018 Sales and other operating revenues $ 19 141 45 Other income (loss) 4 4 7 Purchased commodities 11 (118) (41) The (gains) losses from foreign currency exchange on our consolidated income statement were: Millions of Dollars 2020 2019 2018 Foreign currency transaction (gains) losses $ (40) 16 1
Net exposures/net notional positions of derivative contracts	The table below summarizes our material net exposures contracts: Open Position Long/(Short) 2020 2019 Commodity Natural gas and power (billions of cubic feet equivalent) Fixed price (20) (5) Basis (10) (23) We had the following net notional position of outstanding foreign currency exchange In Millions Notional Currency 2020 2019 Foreign Currency Exchange Derivatives Buy British pound, sell euro GBP - 4 Sell British pound, buy euro GBP 5 - Sell Canadian dollar, buy U.S. dollar CAD 370 1,337
Net carrying amount of held to maturity investments	The following investments are carried on our table reflects remaining maturities at December Millions of Dollars Carrying Amount Cash and Cash Equivalents Short-Term Investments Investments and Long- Term Receivables 2020 2019 2020 2019 2020 2019 Cash $ 597 759 Demand Deposits 1,133 1,483 Time Deposits 1 to 90 days 1,225 2,030 2,859 1,395 91 to 180 days 448 465 Within one year 13 - One year through five years 1 - Commercial Paper 1 to 90 days - 413 - 1,069 U.S. Government Obligations 1 to 90 days 23 394 - - $ 2,978 5,079 3,320 2,929 1 -
Debt Securities Carried at Fair Value	The following investments in debt securities balance sheet at fair value as of December 31, Millions of Dollars Carrying Amount Cash and Cash Equivalents Short-Term Investments Investments and Long- Term Receivables 2020 2019 2020 2019 2020 2019 Major Security Type Corporate Bonds $ - 1 130 59 143 99 Commercial Paper 13 8 155 30 U.S. Government Obligations - - 4 10 13 15 U.S. Government Agency 17 - Foreign Government Obligations 2 - Asset-backed Securities - - 41 19 $ 13 9 289 99 216 133 Cash and Cash Equivalents and Short-Term Investments have remaining maturities Investments and Long-Term Receivables have remaining maturities
Schedule of Unrealized Loss on Investments [Table Text Block]	The following table summarizes the amortized classified as available for sale: Millions of Dollars Amortized Cost Basis Fair Value 2020 2019 2020 2019 Major Security Type Corporate bonds $ 271 159 273 159 Commercial paper 168 38 168 38 U.S. government obligations 17 25 17 25 U.S. government agency obligations 17 - 17 - Foreign government obligations 2 - 2 - Asset-backed securities 41 19 41 19 $ 516 241 518 241

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	12 Months Ended
	Dec. 31, 2020
Fair Value Measurement [Abstract]
Fair value hierarchy for gross financial assets and liabilities	The following table summarizes the fair value unadjusted where the right of setoff exists for commodity basis): Millions of Dollars December 31, 2020 December 31, 2019 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets Investment in Cenovus Energy $ 1,256 - - 1,256 2,111 - - 2,111 Investments in debt securities 17 501 - 518 25 216 - 241 Commodity derivatives 142 101 12 255 172 114 36 322 Total assets $ 1,415 602 12 2,029 2,308 330 36 2,674 Liabilities Commodity derivatives $ 120 91 9 220 174 115 22 311 Total liabilities $ 120 91 9 220 174 115 22 311
Commodity derivative balances subject to right of setoff	The following table summarizes those commodity presented on our consolidated balance sheet. multiple derivative instruments executed with the same right of setoff exists. Millions of Dollars Amounts Subject to Right of Setoff Gross Amounts Not Gross Net Amounts Subject to Gross Amounts Amounts Cash Net Recognized Right of Setoff Amounts Offset Presented Collateral Amounts December 31, 2020 Assets $ 255 2 253 157 96 10 86 Liabilities 220 1 219 157 62 4 58 December 31, 2019 Assets $ 322 3 319 193 126 4 122 Liabilities 311 4 307 193 114 12 102 At December 31, 2020 and December 31, 2019, balance sheet where we had the right of setoff.
Values of assets, by major category, measured at fair value on a nonrecurring basis	Non-Recurring Fair Value Measurement The following table summarizes the fair value assets accounted for at fair value on a non-recurring Millions of Dollars Fair Value Measurements Using Fair Value Level 1 Inputs Level 2 Inputs Level 3 Inputs Before-Tax Loss Year Net PP&E (held for use) $ 65 - - 65 522 268 - - 268 287 Year Net PP&E (held for sale) $ 194 194 - - 351 166 166 - - 28 Equity Method Investments 171 171 - - 60 30 - 30 - 95
Fair value measurement inputs and valuation techniques	The range and arithmetic average of significant unobservable inputs significant assets were as follows: Fair Value (Millions of Dollars) Valuation Technique Unobservable Inputs Range (Arithmetic Average) March 31, 2020 Wind River Basin $ 65 Discounted cash flow Natural gas production (MMCFD) 8.4 55.2 22.9 ) Natural gas price outlook* ($/MMBTU) $ 2.67 9.17 5.68 ) Discount rate** 7.9 % 9.1 % ( 8.3 %) 2.2 % annually after year 2034. **Determined as the weighted average cost of capital of a group Fair Value (Millions of Dollars) Valuation Technique Unobservable Inputs Range (Arithmetic Average) December 31, 2020 Central Basin Platform $ 244 Discounted cash flow Commodity production (MBOED) 0.5 12.7 3.4 ) Commodity price outlook* ($/BOE) $ 37.35 115.29 ($ 73.80 ) Discount rate** 6.8 % 7.7 % ( 7.4 %) *Commodity price outlook based on a combination of external pricing 2.0% annually after year 2050. **Determined as the weighted average cost of capital of a group
Commodity derivative and financial instruments	The following table summarizes the net fair setoff exists for commodity derivatives): Millions of Dollars Carrying Amount Fair Value 2020 2019 2020 2019 Financial assets Investment in Cenovus Energy $ 1,256 2,111 1,256 2,111 Commodity derivatives 88 125 88 125 Investments in debt securities 518 241 518 241 Loans and advances—related parties 220 339 220 339 Financial liabilities Total debt, excluding finance leases 14,478 14,175 19,106 18,108 Commodity derivatives 59 106 59 106

Equity (Tables)

Equity (Tables)	12 Months Ended
	Dec. 31, 2020
Equity [Abstract]
Changes in shares of common stock	Note 15—Equity Common Stock The changes in our shares of common stock, as categorized Shares 2020 2019 2018 Issued Beginning of year 1,795,652,203 1,791,637,434 1,785,419,175 Distributed under benefit plans 3,192,064 4,014,769 6,218,259 End of year 1,798,844,267 1,795,652,203 1,791,637,434 Held in Treasury Beginning of year 710,783,814 653,288,213 608,312,034 Repurchase of common stock 20,018,275 57,495,601 44,976,179 End of year 730,802,089 710,783,814 653,288,213

Non Mineral Leases (Tables)

Non Mineral Leases (Tables)	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Lease, Assets And Liabilities [Table Text Block]	The following table summarizes leases on our consolidated balance sheet as of December Millions of Dollars 2020 2019 Operating Leases Finance Leases Operating Leases Finance Leases Right-of-Use Assets Properties, plants and equipment Gross $ 1,375 1,039 Accumulated DD&A (721) (649) Net PP&E * 654 390 Prepaid expenses and other current assets $ - 40 Other assets 783 896 Lease Liabilities Short-term debt ** $ 168 87 Other accruals 226 347 Long-term debt *** 723 633 Other liabilities and deferred credits 559 585 Total lease liabilities $ 785 891 932 720 * 258 335 97 56 *** Includes proportionately consolidated finance lease liabilities of $ 522 579
Lease, Cost [Table Text Block]	The following table summarizes our lease costs Millions of Dollars 2020 2019 Lease Cost * Operating lease cost $ 321 341 Finance lease cost Amortization of right-of-use assets 163 99 Interest on lease liabilities 34 37 Short-term lease cost ** 42 77 Total lease cost *** $ 560 554 * The amounts presented in the table above have not been adjusted to reflect amounts recovered or reimbursed from oil and gas coventurers. *** Variable lease cost and sublease income are immaterial for the periods presented and therefore are not included in the table above The following table summarizes the lease terms 2020 2019 Lease Term and Discount Rate Weighted-average term (years) Operating leases 6.11 5.19 Finance leases 7.12 8.70 Weighted-average discount rate (percent) Operating leases 2.78 3.10 Finance leases 4.27 5.53 The following table summarizes other lease information Millions of Dollars 2020 2019 Other Information * Cash paid for amounts included in the measurement Operating cash flows from operating leases $ 232 203 Operating cash flows from finance leases 11 27 Financing cash flows from finance leases 255 81 Right-of-use assets obtained in exchange for $ 250 499 Right-of-use assets obtained in exchange for 426 26 *The amounts presented in the table above have not been adjusted to reflect amounts recovered or reimbursed from oil and gas coventurers. addition, pursuant to other applicable accounting guidance, lease are reported in the "Cash Flows From Investing Activities" section of our consolidated statement of cash flows.
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	The following table summarizes future lease Millions of Dollars Operating Leases Finance Maturity of Lease Liabilities 2021 $ 245 213 2022 155 162 2023 116 148 2024 94 113 2025 55 87 Remaining years 200 320 Total * 865 1,043 Less: portion representing imputed interest (80) (152) Total lease liabilities $ 785 891 *Future lease payments for operating and finance leases commencing on or components in accordance with our election to adopt the optional practical components for accounting purposes. company have been included in the table on a proportionate basis consistent company or oil and gas venture.
Finance Lease, Liability, Maturity [Table Text Block]	The following table summarizes future lease Millions of Dollars Operating Leases Finance Maturity of Lease Liabilities 2021 $ 245 213 2022 155 162 2023 116 148 2024 94 113 2025 55 87 Remaining years 200 320 Total * 865 1,043 Less: portion representing imputed interest (80) (152) Total lease liabilities $ 785 891 *Future lease payments for operating and finance leases commencing on or components in accordance with our election to adopt the optional practical components for accounting purposes. company have been included in the table on a proportionate basis consistent company or oil and gas venture.
Schedule of Rent Expense [Table Text Block]	For the year ended December 31, 2018 operating Millions of Dollars Total rentals $ 253 Less: sublease rentals (16) $ 237

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2020
Compensation And Retirement Disclosure [Abstract]
Pension and Postretirement Plans	An analysis of the projected benefit obligations our postretirement health and life insurance plans Millions of Dollars Pension Benefits Other Benefits 2020 2019 2020 2019 U.S. Int’l. U.S. Int’l. Change in Benefit Obligation Benefit obligation at January 1 $ 2,319 3,880 2,136 3,438 216 218 Service cost 85 54 79 69 2 1 Interest cost 66 85 79 97 6 8 Plan participant contributions - 1 - 2 18 20 Plan amendments - 2 - - (30) - Actuarial loss 319 398 278 387 7 27 Benefits paid (241) (151) (253) (147) (49) (59) Curtailment - 2 - (69) - - Recognition of termination benefits - 3 - 1 - - Foreign currency exchange rate change - 129 - 102 - 1 Benefit obligation at December 31 * $ 2,548 4,403 2,319 3,880 170 216 *Accumulated benefit obligation portion of above at $ 2,359 4,095 2,161 3,594 Change in Fair Value of Plan Assets Fair value of plan assets at January 1 $ 1,591 4,306 1,336 3,358 - - Actual return on plan assets 321 416 273 529 - - Company contributions 99 60 235 464 31 39 Plan participant contributions - 1 - 2 18 20 Benefits paid (241) (151) (253) (147) (49) (59) Foreign currency exchange rate change - 161 - 100 - - Fair value of plan assets at December 31 $ 1,770 4,793 1,591 4,306 - - Funded Status $ (778) 390 (728) 426 (170) (216)
Defined Benefit Plan, Plan with Projected and Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block]	The following tables set forth information related accumulated benefit obligations in excess of 2019: Millions of Dollars Pension Benefits 2020 2019 U.S. Int’l. U.S. Int’l. Pension Plans with Projected Benefit Obligation in Excess of Plan Assets Projected benefit obligation $ 2,548 391 2,319 355 Fair value of plan assets 1,770 35 1,591 44 Pension Plans with Accumulated Benefit Excess of Plan Assets Accumulated benefit obligation $ 2,359 338 2,161 299 Fair value of plan assets 1,770 35 1,591 44
Amounts Recognized in the Consolidated Balance Sheet	Millions of Dollars Pension Benefits Other Benefits 2020 2019 2020 2019 U.S. Int’l. U.S. Int’l. Amounts Recognized in the Consolidated Balance Sheet at December 31 Noncurrent assets $ - 746 - 765 - - Current liabilities (56) (11) (21) (6) (39) (42) Noncurrent liabilities (722) (345) (707) (333) (131) (174) Total recognized $ (778) 390 (728) 426 (170) (216) Weighted-Average Assumptions Used to Determine Benefit Obligations at December 31 Discount rate 2.30 % 1.80 3.25 2.35 2.15 3.10 Rate of compensation increase 4.00 3.10 4.00 3.35 Interest crediting rate for applicable benefits 2.10 - 4.10 - Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for Years Discount rate 3.05 % 2.35 3.95 2.90 3.10 4.05 Expected return on plan assets 5.80 3.60 5.80 4.10 Rate of compensation increase 4.00 3.35 4.00 3.65 Interest crediting rate for applicable benefits 4.10 - 4.35 -
Weighted-Average Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost	Millions of Dollars Pension Benefits Other Benefits 2020 2019 2020 2019 U.S. Int’l. U.S. Int’l. Amounts Recognized in the Consolidated Balance Sheet at December 31 Noncurrent assets $ - 746 - 765 - - Current liabilities (56) (11) (21) (6) (39) (42) Noncurrent liabilities (722) (345) (707) (333) (131) (174) Total recognized $ (778) 390 (728) 426 (170) (216) Weighted-Average Assumptions Used to Determine Benefit Obligations at December 31 Discount rate 2.30 % 1.80 3.25 2.35 2.15 3.10 Rate of compensation increase 4.00 3.10 4.00 3.35 Interest crediting rate for applicable benefits 2.10 - 4.10 - Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for Years Discount rate 3.05 % 2.35 3.95 2.90 3.10 4.05 Expected return on plan assets 5.80 3.60 5.80 4.10 Rate of compensation increase 4.00 3.35 4.00 3.65 Interest crediting rate for applicable benefits 4.10 - 4.35 -
Before tax amounts unrecognized in net periodic postretirement benefit cost	Included in accumulated other comprehensive amounts that had not been recognized in net Millions of Dollars Pension Benefits Other Benefits 2020 2019 2020 2019 U.S. Int’l. U.S. Int’l. Unrecognized net actuarial loss $ 467 326 479 227 14 8 Unrecognized prior service credit - - - (2) (182) (183)
Sources of change in other comprehensive income	Millions of Dollars Pension Benefits Other Benefits 2020 2019 2020 2019 U.S. Int’l. U.S. Int’l. Sources of Change in Other Comprehensive Income (Loss) Net gain (loss) arising during the period $ (83) (120) (79) 51 (7) (27) Amortization of actuarial (gain) loss included in income (loss)* 95 21 116 32 1 (2) Net change during the period $ 12 (99) 37 83 (6) (29) Prior service credit (cost) arising during the period $ - (1) - - 30 - Amortization of prior service cost (credit) included in income (loss) - (1) - (2) (31) (33) Net change during the period $ - (2) - (2) (1) (33) *Includes settlement (gains) losses recognized in 2020 and 2019.
Net periodic benefit cost of all defined benefit plans	The components of net periodic benefit cost of Millions of Dollars Pension Benefits Other Benefits 2020 2019 2018 2020 2019 2018 U.S. Int’l. U.S. Int’l. U.S. Int’l. Components of Net Periodic Benefit Cost Service cost $ 85 54 79 69 83 81 2 1 1 Interest cost 66 85 79 97 99 107 6 8 8 Expected return on plan assets (85) (145) (74) (138) (114) (155) - - - Amortization of prior service credit - (1) - (2) - (5) (31) (33) (35) Recognized net actuarial loss (gain) 51 22 54 32 53 31 1 (2) (1) Settlements loss (gain) 44 (1) 62 - 196 - - - - Net periodic benefit cost $ 161 14 200 58 317 59 (22) (26) (27)
Fair values of our pension plan assets	The fair values of our pension plan assets at Millions of Dollars U.S. International Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total 2020 Equity securities U.S. $ - 3 5 8 - - - - International 99 - - 99 - - - - Mutual funds 72 - - 72 235 734 - 969 Debt securities Corporate - 1 - 1 - - - - Mutual funds - - - - 455 - - 455 Cash and cash equivalents - - - - 74 - - 74 Derivatives - - - - 6 - - 6 Real estate - - - - - - 142 142 Total in fair value hierarchy $ 171 4 5 180 770 734 142 1,646 Investments measured at net asset value* Equity securities Common/collective trusts $ 678 2,962 Debt securities Common/collective trusts 730 67 Cash and cash equivalents 8 - Real estate 79 112 Total** $ 171 4 5 1,675 770 734 142 4,787 **Excludes the participating interest in the insurance annuity contract with a net 94 7 The fair values of our pension plan assets at Millions of Dollars U.S. International Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total 2019 Equity securities U.S. $ 94 - 7 101 435 - - 435 International 98 - - 98 266 - - 266 Mutual funds 93 - - 93 245 267 - 512 Debt securities Government - - - - 1,412 - - 1,412 Corporate - 2 - 2 - - - - Mutual funds - - - - 392 - - 392 Cash and cash equivalents - - - - 98 - - 98 Derivatives - - - - 11 - - 11 Real estate - - - - - - 132 132 Total in fair value hierarchy $ 285 2 7 294 2,859 267 132 3,258 Investments measured at net asset value* Equity securities Common/collective trusts $ 457 167 Debt securities Common/collective trusts 637 760 Cash and cash equivalents 25 - Real estate 83 112 Total** $ 285 2 7 1,496 2,859 267 132 4,297 **Excludes the participating interest in the insurance annuity contract with a 95 9
Benefit payments excluding the participating annuity contract and which reflect expected future service, as appropriate, are expected to be paid:	The following benefit payments, which are exclusive and which reflect expected future service, as appropriate, Millions of Dollars Pension Other Benefits Benefits U.S. Int’l. 2021 $ 532 147 25 2022 289 151 21 2023 248 156 18 2024 232 162 16 2025 215 166 14 2026–2030 845 897 53
Share-based compensation expense recognized in income and the associated tax benefit	Compensation Expense —Total share-based compensation expense recognized in net income (loss) and the associated tax benefit for the years ended Millions of Dollars 2020 2019 2018 Compensation cost $ 159 274 265 Tax benefit 40 71 64
Summary of stock option activity	The following summarizes our stock option activity Millions of Dollars Weighted-Average Aggregate Options Exercise Price Intrinsic Value Outstanding at December 31, 2019 18,040,197 $ 54.11 $ 206 Exercised (1,111,805) 38.80 23 Forfeited (5,867) 49.76 Expired or cancelled - Outstanding at December 31, 2020 16,922,525 $ 55.12 $ 22 Vested at December 31, 2020 16,922,525 $ 55.12 $ 22 Exercisable at December 31, 2020 16,922,525 $ 55.12 $ 22
Summary of restricted stock unit activity	The following summarizes our stock-settled stock Weighted-Average Millions of Dollars Stock Units Grant Date Fair Value Total Fair Value Outstanding at December 31, 2019 6,223,046 $ 55.99 Granted 2,890,840 57.40 Forfeited (127,181) 55.84 Issued (2,554,720) 50.16 $ 143 Outstanding at December 31, 2020 6,431,985 $ 58.94 Not Vested at December 31, 2020 4,230,413 59.01 The following summarizes our cash-settled stock Weighted-Average Millions of Dollars Stock Units Grant Date Fair Value Total Fair Value Outstanding at December 31, 2019 596,991 $ 64.54 Granted 24,437 41.59 Forfeited (5,622) 40.01 Issued (1,191) 40.20 $ - Outstanding at December 31, 2020 614,615 $ 39.95 Not Vested at December 31, 2020 121,696 39.95
Summary of Performance Share Program activity	The following summarizes our stock-settled Performance December 31, 2020: Weighted-Average Millions of Dollars Stock Units Grant Date Fair Value Total Fair Value Outstanding at December 31, 2019 2,024,824 $ 50.55 Granted 26,244 58.61 Forfeited - Issued (314,340) 51.15 $ 13 Outstanding at December 31, 2020 1,736,728 $ 50.56 Not Vested at December 31, 2020 3,191 $ 48.61 The following summarizes our cash-settled Performance December 31, 2020: Weighted-Average Millions of Dollars Stock Units Grant Date Fair Value Total Fair Value Outstanding at December 31, 2019 609,274 $ 64.54 Granted 1,491,098 58.61 Forfeited - Settled (1,975,843) 58.54 $ 116 Outstanding at December 31, 2020 124,529 $ 39.95
Summary of aggregate activity of restricted shares and units	The following summarizes the aggregate activity December 31, 2020: Weighted-Average Millions of Dollars Stock Units Grant Date Fair Value Total Fair Value Outstanding at December 31, 2019 991,908 $ 47.24 Granted 77,824 51.46 Cancelled (1,336) 23.09 Issued (98,297) 45.57 $ 6 Outstanding at December 31, 2020 970,099 $ 47.78
Severance accrual	The following table summarizes our severance accrual Millions of Dollars 2020 2019 2018 Balance at January 1 $ 23 48 53 Accruals 14 (1) 70 Benefit payments (13) (24) (73) Foreign currency translation adjustments - - (2) Balance at December 31 $ 24 23 48

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2020
Income Taxes [Abstract]
Income taxes charged to income (loss)	Note 18—Income Taxes Components of income tax expense (benefit) Millions of Dollars 2020 2019 2018 Income Taxes Federal Current $ 3 18 4 Deferred (625) (113) 545 Foreign Current 350 2,545 3,273 Deferred (70) (323) (166) State and local Current (4) 148 108 Deferred (139) (8) (96) $ (485) 2,267 3,668
Components of deferred tax liabilities and assets	Deferred income taxes reflect the net tax effect of temporary assets and liabilities for financial reporting purposes of deferred tax liabilities and assets at December Millions of Dollars 2020 2019 Deferred Tax Liabilities PP&E and intangibles $ 7,744 8,660 Inventory 64 35 Other 242 234 Total deferred tax liabilities 8,050 8,929 Deferred Tax Assets Benefit plan accruals 540 542 Asset retirement obligations and accrued environmental 2,262 2,339 Investments in joint ventures 1,653 1,722 Other financial accruals and deferrals 907 777 Loss and credit carryforwards 8,904 8,968 Other 365 345 Total deferred tax assets 14,631 14,693 Less: valuation allowance (9,965) (10,214) Total deferred tax assets net of valuation allowance 4,666 4,479 Net deferred tax liabilities $ 3,384 4,450
Reconciliation of deferred tax asset valuation allowance	The following table shows a reconciliation for for 2020, 2019 and 2018: Millions of Dollars 2020 2019 2018 Balance at January 1 $ 10,214 3,040 1,254 Charged to expense (benefit) 460 (225) (26) Other* (709) 7,399 1,812 Balance at December 31 $ 9,965 10,214 3,040 *Represents changes due to originating deferred tax asset that have no impact to our effective effect of translating foreign financial statements. presentation, with no impacts to beginning and ending balances.
Reconciliation of the beginning and ending unrecognized tax benefits	The following table shows a reconciliation 2019 and 2018: Millions of Dollars 2020 2019 2018 Balance at January 1 $ 1,177 1,081 882 Additions based on tax positions related to the current 6 9 268 Additions for tax positions of prior years 67 120 43 Reductions for tax positions of prior years (34) (22) (73) Settlements (9) (9) (35) Lapse of statute (1) (2) (4) Balance at December 31 $ 1,206 1,177 1,081
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	The amounts of U.S. and foreign income (loss) statutory rate to the provision for income taxes, Millions of Dollars Percent of Pre-Tax Income (Loss) 2020 2019 2018 2020 2019 2018 Income (loss) before income taxes United States $ (3,587) 4,704 2,867 114.2 % 49.4 28.7 Foreign 447 4,820 7,106 (14.2) 50.6 71.3 $ (3,140) 9,524 9,973 100.0 % 100.0 100.0 Federal statutory income tax $ (659) 2,000 2,095 21.0 % 21.0 21.0 Non-U.S. effective tax rates 194 1,399 1,766 (6.2) 14.7 17.7 Tax Legislation - - (10) - - (0.1) Australia disposition (349) - - 11.1 - - U.K. disposition - (732) (150) - (7.7) (1.5) Recovery of outside basis (22) (77) (21) 0.7 (0.8) (0.2) Adjustment to tax reserves 18 9 (4) (0.6) 0.1 - Adjustment to valuation allowance 460 (225) (26) (14.6) (2.4) (0.3) State income tax (112) 123 135 3.6 1.3 1.4 Malaysia Deepwater Incentive - (164) - - (1.7) - Enhanced oil recovery credit (6) (27) (99) 0.2 (0.3) (1.0) Other (9) (39) (18) 0.3 (0.4) (0.2) $ (485) 2,267 3,668 15.5 % 23.8 36.8

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated other comprehensive income in the equity section of the balance sheet included	Note 19—Accumulated Other Comprehensive Loss Accumulated other comprehensive loss in the Millions of Dollars Defined Benefit Plans Net Unrealized Loss on Securities Foreign Currency Translation Accumulated Other Comprehensive Loss December 31, 2017 $ (400) (58) (5,060) (5,518) Other comprehensive income (loss) 39 - (642) (603) Cumulative effect of adopting ASU No. 2016-01* - 58 - 58 December 31, 2018 (361) - (5,702) (6,063) Other comprehensive income 51 - 695 746 Cumulative effect of adopting ASU No. 2018-02** (40) - - (40) December 31, 2019 (350) - (5,007) (5,357) Other comprehensive income (loss) (75) 2 212 139 December 31, 2020 $ (425) 2 (4,795) (5,218) 1, 2019. During 2019, we recognized $ 483 of our sale of two ConocoPhillips U.K. subsidiaries. Note 4—Asset Acquisitions and Dispositions.
Items reclassified out of accumulated other comprehensive income (loss)	The following table summarizes reclassifications ended December 31: Millions of Dollars 2020 2019 Defined Benefit Plans $ 72 88 Above amounts are included in the computation of net periodic benefit cost are presented net of tax expense of: $ 13 23 See Note 17—Employee Benefit Plans, for additional information.

Cash Flow Information (Tables)

Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2020
Cash Flow Information [Abstract]
Cash Flow Information	Note 20—Cash Flow Information Millions of Dollars 2020 2019 2018 Noncash Investing Activities Increase (decrease) in PP&E related to an increase retirement obligations $ (116) 205 395 Increase (decrease) in assets and liabilities exchange* Accounts receivable - - (44) Inventories - - 42 Investments and long-term receivables - - 15 PP&E - - 1,907 Other long-term assets - - (9) Accounts payable - - 7 Accrued income and other taxes - - 40 Cash Payments Interest $ 785 810 772 Income taxes 905 2,905 2,976 Net Sales (Purchases) of Investments Short-term investments purchased $ (12,435) (4,902) (1,953) Short-term investments sold 12,015 2,138 3,573 Investments and long-term receivables purchased (325) (146) - Investments and long-term receivables sold 87 - - $ (658) (2,910) 1,620 *See Note 4—Asset Acquisitions and Dispositions.

Other Financial Information (Ta

Other Financial Information (Tables)	12 Months Ended
	Dec. 31, 2020
Other Financial Information [Abstract]
Other Financial Information	Note 21—Other Financial Information Millions of Dollars 2020 2019 2018 Interest and Debt Expense Incurred Debt $ 788 799 838 Other 73 36 67 861 835 905 Capitalized (55) (57) (170) Expensed $ 806 778 735 Other Income (Loss) Interest income $ 100 166 97 Unrealized gains (losses) on Cenovus Energy common shares* (855) 649 (437) Other, net 246 543 513 $ (509) 1,358 173 *See Note 6—Investment in Cenovus Energy, for additional information. Research and Development Expenditures —expensed $ 75 82 78 Shipping and Handling Costs $ 857 1,008 1,075 Foreign Currency Transaction (Gains) Losses —after-tax Alaska $ - - - Lower 48 - - - Canada (7) 5 (11) Europe, Middle East and North Africa (15) - (26) Asia Pacific (11) 31 3 Other International 2 1 - Corporate and Other (31) 21 21 $ (62) 58 (13)
Property, Plant And Equipment [Table Text Block]	Millions of Dollars 2020 2019 Properties, Plants and Equipment Proved properties $ 94,312 88,284 * Unproved properties 4,141 3,980 * Other 3,653 5,482 Gross properties, plants and equipment 102,106 97,746 Less: Accumulated depreciation, depletion and amortization (62,213) (55,477) * Net properties, plants and equipment $ 39,893 42,269 *Excludes assets classified as held for sale at December 31, — Asset Acquisitions and Dispositions, for additional information.

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2020
Related Party Transactions [Abstract]
Significant transactions with related parties	Note 22—Related Party Transactions Our related parties primarily include equity method For disclosures on trusts for the benefit of employees, — Employee Benefit Plans. Significant transactions with our equity affiliates Millions of Dollars 2020 2019 2018 Operating revenues and other income $ 79 89 98 Purchases - 38 98 Operating expenses and selling, general and administrative 63 65 60 Net interest income* (5) (13) (14) *We paid interest to, or received interest from,

Sales and Other Operating Rev_2

Sales and Other Operating Revenues (Tables)	12 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue [Table Text Block]	Millions of Dollars 2020 2019 2018 Revenue from contracts with customers $ 13,662 26,106 28,098 Revenue from contracts outside the scope of ASC Physical contracts meeting the definition of a derivative 5,177 6,558 8,218 Financial derivative contracts (55) (97) 101 Consolidated sales and other operating revenues $ 18,784 32,567 36,417 Millions of Dollars 2020 2019 2018 Revenue from Outside the Scope of ASC Topic 606 by Segment Lower 48 $ 3,966 4,989 6,358 Canada 727 691 629 Europe, Middle East and North Africa 484 878 1,231 Physical contracts meeting the definition of a derivative $ 5,177 6,558 8,218 Millions of Dollars 2020 2019 2018 Revenue from Outside the Scope of ASC Topic 606 by Product Crude oil $ 395 804 1,112 Natural gas 4,339 5,313 6,734 Other 443 441 372 Physical contracts meeting the definition of a derivative $ 5,177 6,558 8,218
Contract with Customer, Asset and Liability [Table Text Block]	Millions of Dollars Contract Liabilities At December 31, 2019 $ 80 Contractual payments received 17 At December 31, 2020 $ 97 Amounts Recognized in the Consolidated Current liabilities $ 56 Noncurrent liabilities 41 $ 97

Segment Disclosures and Relat_2

Segment Disclosures and Related Information (Tables)	12 Months Ended
	Dec. 31, 2020
Segment Disclosures and Related Information [Abstract]
Sales and Other Operating Revenues	Analysis of Results by Operating Segment Millions of Dollars 2020 2019 2018 Sales and Other Operating Revenues Alaska $ 3,408 5,483 5,740 Intersegment eliminations (11) - - Alaska 3,397 5,483 5,740 Lower 48 9,872 15,514 17,029 Intersegment eliminations (51) (46) (40) Lower 48 9,821 15,468 16,989 Canada 1,666 2,910 3,184 Intersegment eliminations (405) (1,141) (1,160) Canada 1,261 1,769 2,024 Europe, Middle East and North Africa 1,919 5,101 6,635 Intersegment eliminations (2) - - Europe, Middle East and North Africa 1,917 5,101 6,635 Asia Pacific 2,363 4,525 4,861 Other International 7 - - Corporate and Other 18 221 168 Consolidated sales and other operating revenues $ 18,784 32,567 36,417 The market for our products is large and diverse, therefore, dependent upon any single customer.
Depreciation, Depletion, Amortization and Impairments	Millions of Dollars 2020 2019 2018 Depreciation, Depletion, Amortization and Impairments Alaska $ 996 805 760 Lower 48 3,358 3,224 2,370 Canada 342 232 324 Europe, Middle East and North Africa 775 887 1,041 Asia Pacific 809 1,285 1,382 Other International - - - Corporate and Other 54 62 106 Consolidated depreciation, depletion, amortization $ 6,334 6,495 5,983
Equity in Earnings of Affiliates	Equity in Earnings of Affiliates Alaska $ (7) 7 6 Lower 48 (11) (159) 1 Canada - - - Europe, Middle East and North Africa 311 470 744 Asia Pacific 137 461 323 Other International 2 - - Corporate and Other - - - Consolidated equity in earnings of affiliates $ 432 779 1,074
Income Taxes	Income Tax Provision (Benefit) Alaska $ (256) 472 376 Lower 48 (378) 137 474 Canada (185) (43) (96) Europe, Middle East and North Africa 136 1,425 2,259 Asia Pacific 294 501 728 Other International (20) 8 30 Corporate and Other (76) (233) (103) Consolidated income tax provision (benefit) $ (485) 2,267 3,668
Net Income Attributable to ConocoPhillips	Net Income (Loss) Attributable to ConocoPhillips Alaska $ (719) 1,520 1,814 Lower 48 (1,122) 436 1,747 Canada (326) 279 63 Europe, Middle East and North Africa 448 3,170 2,594 Asia Pacific 962 1,483 1,342 Other International (64) 263 364 Corporate and Other (1,880) 38 (1,667) Consolidated net income (loss) attributable $ (2,701) 7,189 6,257
Investments In and Advances To Affiliates	Millions of Dollars 2020 2019 2018 Investments in and Advances to Affiliates Alaska $ 62 83 86 Lower 48 25 35 378 Canada - - - Europe, Middle East and North Africa 918 1,070 1,311 Asia Pacific 6,705 7,265 7,565 Other International - - - Corporate and Other - - - Consolidated investments in and advances to affiliates $ 7,710 8,453 9,340
Total Assets	Total Assets Alaska $ 14,623 15,453 14,648 Lower 48 11,932 14,425 14,888 Canada 6,863 6,350 5,748 Europe, Middle East and North Africa 8,756 9,269 11,276 Asia Pacific 11,231 13,568 14,758 Other International 226 285 89 Corporate and Other 8,987 11,164 8,573 Consolidated total assets $ 62,618 70,514 69,980
Capital Expenditures and Investments	Capital Expenditures and Investments Alaska $ 1,038 1,513 1,298 Lower 48 1,881 3,394 3,184 Canada 651 368 477 Europe, Middle East and North Africa 600 708 877 Asia Pacific 384 584 718 Other International 121 8 6 Corporate and Other 40 61 190 Consolidated capital expenditures and investments $ 4,715 6,636 6,750
Interest Income and Expense	Interest Income and Expense Interest income Alaska $ - - - Lower 48 - - - Canada - - - Europe, Middle East and North Africa 5 11 12 Asia Pacific 7 6 5 Other International - - - Corporate and Other 88 149 80 Interest and debt expense Corporate and Other $ 806 778 735
Geographic Information	Geographic Information Millions of Dollars Sales and Other Operating Revenues (1) Long-Lived Assets (2) 2020 2019 2018 2020 2019 2018 United States $ 13,230 21,159 22,740 24,034 26,566 26,838 Australia and Timor-Leste 605 1,647 1,798 6,676 7,228 9,301 Canada 1,261 1,769 2,024 6,385 5,769 5,333 China 460 772 836 1,491 1,447 1,380 Indonesia 689 875 886 464 605 669 Libya 155 1,103 1,142 670 668 679 Malaysia 610 1,230 1,346 1,501 1,871 2,327 Norway 1,426 2,349 2,886 5,294 5,258 5,582 United Kingdom 336 1,649 2,606 1 2 1,583 Other foreign countries 12 14 153 1,087 1,308 1,346 Worldwide consolidated $ 18,784 32,567 36,417 47,603 50,722 55,038
Sales and Other Operating Revenues by Product	Sales and Other Operating Revenues by Crude oil $ 9,736 18,482 19,571 Natural gas 6,427 8,715 10,720 Natural gas liquids 528 814 1,114 Other* 2,093 4,556 5,012 Consolidated sales and other operating revenues $ 18,784 32,567 36,417 *Includes LNG and bitumen.

Acquisition of Cohcho Resources

Acquisition of Cohcho Resources Inc. (Tables)	12 Months Ended
	Dec. 31, 2020
Business Combinations [Abstract]
Fair Value of Total Consideration Transferred	Note 25—Acquisition of Concho Resources Inc. On October 18, 2020 , we entered into a definitive agreement The transaction closed on January 15, 2021 share of Concho common stock was exchanged 1.46 stock, for total consideration of $ 13.1 286 approximately 21 transaction. We also assumed Concho’s outstanding debt of $ 3.9 value of $ 4.7 which settled on February 8, 2021, for 98 Concho were exchanged for new notes issued by guaranteed by ConocoPhillips Company. As of the acquisition date, January 15, 2021, the Total Consideration 194,243 1,599 Number of shares exchanged 195,842 1.46 285,929 $ 45.9025 $ 13,125 **Based on the ConocoPhillips average stock price on January The transaction will be accounted for as a The total purchase price will be allocated to identifiable their fair values as of the closing date. this transaction and provisional fair value measurements adjust the measurements in subsequent periods, additional information to complete the necessary

Accounting Policies - Textuals

Accounting Policies - Textuals (Details)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Number of operating segments	6
Revenue, Performance Obligation, Description of Payment Terms	Payment is typically due within 30 days or less.

Change in Accounting Principles

Change in Accounting Principles (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Liability	$ 785
Accumulated Other Comprehensive Income (Loss), Net of Tax	(5,218)	$ (5,357)	$ (6,063)	$ (5,518)
Retained Earnings (Accumulated Deficit)	35,213	39,742
Scenario Previously Reported Member [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Liability	$ 785	$ 932
Accounting Standards Update 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement Or Change In Accounting Principle Description	We adopted the provisions of FASB ASU No. 2016-13, “Measurement of Credit Losses on Financial Instruments,” (ASC Topic 326) and its amendments, beginning January 1, 2020. This ASU, as amended, sets forth the current expected credit loss model, a new forward-looking impairment model for certain financial instruments measured at amortized cost basis based on expected losses rather than incurred losses. This ASU, as amended, which primarily applies to our accounts receivable, also requires credit losses related to available-for-sale debt securities to be recorded through an allowance for credit losses. The adoption of this ASU did not have a material impact to our financial statements. The majority of our receivables are due within 30 days or less. We monitor the credit quality of our counterparties through review of collections, credit ratings, and other analyses. We develop our estimated allowance for credit losses primarily using an aging method and analyses of historical loss rates as well as consideration of current and future conditions that could impact our counterparties’ credit quality and liquidity.

Inventories (Details)

Inventories (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Inventory, Net [Abstract]
Crude oil and natural gas	$ 461	$ 472
Materials and supplies	541	554
Inventory Net	$ 1,002	$ 1,026

Inventory Disclosure - Narrativ

Inventory Disclosure - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Inventory, Net [Abstract]
Inventories valued on the LIFO basis	$ 282		$ 286
Lower of cost or market adjustments		$ 228
Excess of current replacement cost over LIFO cost of inventories	$ 87		$ 155

Assets Acquisitions and Dispo_2

Assets Acquisitions and Dispositions Textuals (Details) shares in Millions

Jan. 15, 2021USD ($)shares

May 27, 2020USD ($)MBoe

Aug. 31, 2020USD ($)a

May 31, 2020USD ($)

Mar. 31, 2020USD ($)

Feb. 29, 2020USD ($)

Sep. 30, 2019USD ($)

Apr. 30, 2019USD ($)

Jan. 31, 2019USD ($)

Oct. 31, 2018USD ($)

Dec. 31, 2019USD ($)

Jun. 30, 2019USD ($)

Dec. 31, 2018USD ($)

Sep. 30, 2018USD ($)

Jun. 30, 2018USD ($)

Mar. 31, 2018USD ($)

Dec. 31, 2020USD ($)

Dec. 31, 2019USD ($)

Dec. 31, 2018USD ($)

Jan. 31, 2021USD ($)

Dec. 18, 2018USD ($)

May 17, 2017

Income related items for assets held for sale [Abstract]

Income (Loss) From Equity Method Investments

$ 432,000,000

$ 779,000,000

$ 1,074,000,000

Exploration Expense

1,457,000,000

743,000,000

369,000,000

Gain (Loss) on Disposition of Oil and Gas Property [Abstract]

Equity Method Investments

$ 8,234,000,000

7,596,000,000

8,234,000,000

Business Combinations [Abstract]

Business Combination, Consideration Transferred

$ 13,100,000,000

Business Combination, Share Exchange Ratio

1.46

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt

$ 3,900,000,000

Concho Resources Inc [Member] | Subsequent Event [Member]

Business Combinations [Abstract]

Business Combination, Consideration Transferred

$ 13,125,000,000

Business Combination, Share Exchange Ratio

1.46

Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Shares | shares

286

Long-term Debt

$ 3,900,000,000

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt

$ 4,700,000,000

Operating Segments [Member]

Income related items for assets held for sale [Abstract]

Income (Loss) From Equity Method Investments

432,000,000

779,000,000

1,074,000,000

Corporate, Non-Segment [Member]

Income related items for assets held for sale [Abstract]

Income (Loss) From Equity Method Investments

0

0

0

Alaska Segment [Member] | Operating Segments [Member]

Income related items for assets held for sale [Abstract]

Income (Loss) From Equity Method Investments

(7,000,000)

7,000,000

6,000,000

Lower 48 Segment [Member]

Income related items for assets held for sale [Abstract]

Exploration Expense

141,000,000

Lower 48 Segment [Member] | Operating Segments [Member]

Income related items for assets held for sale [Abstract]

Income (Loss) From Equity Method Investments

(11,000,000)

(159,000,000)

1,000,000

Canada Segment [Member] | Operating Segments [Member]

Income related items for assets held for sale [Abstract]

Income (Loss) From Equity Method Investments

0

0

0

Canada Segment [Member] | Operating Segments [Member] | Montney [Member]

Business Combinations [Abstract]

Oil and Gas, Undeveloped Acreage, Net | a

295,000

Noncontrolling Interest, Ownership Percentage by Parent

100.00%

Canada Segment [Member] | Operating Segments [Member] | Additional Montney Acreage [Member]

Business Combinations [Abstract]

Payments To Acquire Businesses, Gross

$ 382,000,000

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities

$ 31,000,000

Oil and Gas, Undeveloped Acreage, Net | a

140,000

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment

$ 490,000,000

Asset retirement obligations and accrued environmental costs

77,000,000

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt

$ 31,000,000

Asia Pacific and Middle East Segment [Member] | Operating Segments [Member]

Income related items for assets held for sale [Abstract]

Income (Loss) From Equity Method Investments

137,000,000

461,000,000

323,000,000

Asia Pacific [Member]

Income related items for assets held for sale [Abstract]

Exploration Expense

50,000,000

Europe and North Africa Segment [Member] | Operating Segments [Member]

Income related items for assets held for sale [Abstract]

Income (Loss) From Equity Method Investments

311,000,000

470,000,000

744,000,000

Australia West Assets [Member] | Asia Pacific [Member] | Operating Segments [Member]

Asset Held For Sale Transaction Detail [Abstract]

Proceeds from asset dispositions

$ 765,000,000

Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]

Net carrying value

$ 200,000,000

Disposition, Cash

500,000,000

Disposition, PP&E

1,300,000,000

Disposition, Other current assets

100,000,000

Asset Retirement Obligation of held for sale or sold

700,000,000

Disposition, deferred tax liabilities

300,000,000

Disposition, other liabilities

$ 200,000,000

Disposition, Before-tax earnings

(851,000,000)

(372,000,000)

(364,000,000)

Gain (Loss) on Disposition of Oil and Gas Property [Abstract]

Before-tax gain (loss) on disposition

$ 587,000,000

Barossa project [Member] | Asia Pacific [Member] | Operating Segments [Member]

Gain (Loss) on Disposition of Oil and Gas Property [Abstract]

Production | MBoe

43

Barossa project [Member] | Asia Pacific [Member] | Operating Segments [Member] | Scenario Plan [Member]

Asset Held For Sale Transaction Detail [Abstract]

Proceeds from asset dispositions

$ 200,000,000

Caldita Field [Member] | Asia Pacific and Middle East Segment [Member] | Operating Segments [Member]

Asset Held For Sale Transaction Detail [Abstract]

Ownership Percent

37.50%

Bayu-Undan Field [Member] | Asia Pacific and Middle East Segment [Member] | Operating Segments [Member]

Asset Held For Sale Transaction Detail [Abstract]

Ownership Percent

56.90%

Niobrara [Member] | Lower 48 Segment [Member]

Asset Held For Sale Transaction Detail [Abstract]

Proceeds from asset dispositions

$ 359,000,000

Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]

Net carrying value

397,000,000

Disposition, PP&E

433,000,000

Asset Retirement Obligation of held for sale or sold

34,000,000

Gain (Loss) on Disposition of Oil and Gas Property [Abstract]

Before-tax gain (loss) on disposition

$ 38,000,000

Niobrara [Member] | Lower 48 Segment [Member] | Operating Segments [Member]

Income related items for assets held for sale [Abstract]

Results Of Operations Income Before Income Taxes

$ 25,000,000

372,000,000

35,000,000

Impairment of asset held for sale

386,000,000

Golden Pass [Member] | Lower 48 Segment [Member] | Operating Segments [Member]

Asset Held For Sale Transaction Detail [Abstract]

Ownership percentage in equity investment

12.40%

Income related items for assets held for sale [Abstract]

Income (Loss) From Equity Method Investments

$ 60,000,000

U.K. Subsidiaries [Member] | Operating Segments [Member]

Gain (Loss) on Disposition of Oil and Gas Property [Abstract]

After-tax gain (loss) on disposition

2,100,000

$ 900,000

2,100,000

900,000

U.K. Subsidiaries [Member] | Europe and North Africa Segment [Member] | Operating Segments [Member] | Scenario Plan [Member]

Asset Held For Sale Transaction Detail [Abstract]

Proceeds from asset dispositions

$ 2,200,000,000

$ 2,675,000,000

Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]

Net carrying value

500,000,000

Disposition, PP&E

1,600,000,000

Working Capital and cash in net carrying value

100,000,000

Amount of deferred taxes in carrying value of asset

300,000,000

Cumulative foreign currency translation adjustments

500,000,000

Gain (Loss) on Disposition of Oil and Gas Property [Abstract]

Before-tax gain (loss) on disposition

1,700,000,000

After-tax gain (loss) on disposition

2,100,000,000

2,100,000,000

U.K. Subsidiaries [Member] | Europe and North Africa Segment [Member] | Operating Segments [Member] | Asset Retirement Obligation Costs [Member]

Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]

Asset Retirement Obligation of held for sale or sold

$ 1,800,000,000

Greater Sunrise Fields [Member] | Asia Pacific and Middle East Segment [Member] | Operating Segments [Member]

Asset Held For Sale Transaction Detail [Abstract]

Proceeds from asset dispositions

$ 350,000,000

Ownership Percent

30.00%

Gain (Loss) on Disposition of Oil and Gas Property [Abstract]

After-tax gain (loss) on disposition

$ 52,000,000

Magnolia Field And Platform [Member] | Lower 48 Segment [Member] | Operating Segments [Member]

Asset Held For Sale Transaction Detail [Abstract]

Proceeds from asset dispositions

16,000,000

Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]

Disposition, PP&E

4,000,000

4,000,000

Gain (Loss) on Disposition of Oil and Gas Property [Abstract]

Before-tax gain (loss) on disposition

82,000,000

Magnolia Field And Platform [Member] | Lower 48 Segment [Member] | Operating Segments [Member] | Asset Retirement Obligation Costs [Member]

Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]

Asset retirement obligation at disposal

$ 70,000,000

$ 70,000,000

Other properties [Member] | Lower 48 Segment [Member] | Operating Segments [Member]

Asset Held For Sale Transaction Detail [Abstract]

Proceeds from asset dispositions

$ 112,000,000

Gain (Loss) on Disposition of Oil and Gas Property [Abstract]

Before-tax gain (loss) on disposition

$ 0

Undeveloped Leasehold Assets [Member] | Lower 48 Segment [Member] | Operating Segments [Member]

Asset Held For Sale Transaction Detail [Abstract]

Proceeds from asset dispositions

162,000,000

$ 56,000,000

$ 105,000,000

Gain (Loss) on Disposition of Oil and Gas Property [Abstract]

Before-tax gain (loss) on disposition

140,000,000

$ 0

Barnett [Member] | Lower 48 Segment [Member] | Operating Segments [Member]

Asset Held For Sale Transaction Detail [Abstract]

Proceeds from asset dispositions

$ 196,000,000

Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]

Net carrying value

201,000,000

Disposition, PP&E

250,000,000

Gain (Loss) on Disposition of Oil and Gas Property [Abstract]

Before-tax gain (loss) on disposition

5,000,000

Barnett [Member] | Lower 48 Segment [Member] | Operating Segments [Member] | Asset Retirement Obligation Costs [Member]

Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]

Asset retirement obligation at disposal

$ 49,000,000

Income related items for assets held for sale [Abstract]

Results Of Operations Income Before Income Taxes

(59,000,000)

U.K. subsidiary holding Clair field | Europe and North Africa Segment [Member] | Operating Segments [Member]

Asset Held For Sale Transaction Detail [Abstract]

Proceeds from asset dispositions

253,000,000

Ownership Percent

16.50%

Ownership percentage retained

7.50%

Ownership percentage in equity investment

24.00%

Fair Value Assets Disposed Of

$ 1,743,000,000

Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]

Net carrying value

1,028,000,000

Disposition, PP&E

1,553,000,000

Disposition, deferred tax liabilities

485,000,000

Income related items for assets held for sale [Abstract]

Results Of Operations Income Before Income Taxes

$ 748,000,000

Gain (Loss) on Disposition of Oil and Gas Property [Abstract]

Before-tax gain (loss) on disposition

$ 715,000,000

U.K. subsidiary holding Clair field | Europe and North Africa Segment [Member] | Operating Segments [Member] | Asset Retirement Obligation Costs [Member]

Disposal Group, Including Discontinued Operation, Assets, Current [Abstract]

Asset retirement obligation at disposal

$ 59,000,000

Clair Field [Member] | Europe and North Africa Segment [Member] | Operating Segments [Member]

Asset Held For Sale Transaction Detail [Abstract]

Ownership Percent

24.00%

Greater Kuparuk Area [Member] | Alaska Segment [Member] | Operating Segments [Member]

Asset Held For Sale Transaction Detail [Abstract]

Ownership Percent

39.20%

Ownership percentage retained

38.00%

Foster Creek Christina Lake (FCCL) [Member]

Asset Held For Sale Transaction Detail [Abstract]

Ownership percentage in equity investment

50.00%

Waddell Ranch [Member] | Lower 48 Segment [Member]

Asset Held For Sale Transaction Detail [Abstract]

Proceeds from asset dispositions

$ 184,000,000

Gain (Loss) on Disposition of Oil and Gas Property [Abstract]

Before-tax gain (loss) on disposition

$ 0

Aquisitons (Details)

Aquisitons (Details) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	May 31, 2018	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 18, 2018
Business Combinations [Abstract]
Property, Plant and Equipment, Net			$ 39,893,000,000	$ 42,269,000,000
Capitalized Costs, Unproved Properties			4,141,000,000	3,980,000,000
Capitalized Costs Proved Properties			94,312,000,000	88,284,000,000
Inventories Acquired			0	0	$ 42,000,000
Investments and long-term receivables			8,017,000,000	8,687,000,000
Asset Retirement Obligation		$ 7,908,000,000	$ 5,573,000,000	$ 6,206,000,000	$ 7,908,000,000
Kuparuk Assets [Member] | Alaska Segment [Member] | Operating Segments [Member]
Business Acquisition [Line Items]
Costs Incurred, Acquisition of Oil and Gas Properties, Total	$ 386,000,000	1,490,000,000
Percent Acquired	22.00%
Fair Value of Assets Acquired		1,743,000,000
Business Combinations [Abstract]
Capitalized Costs, Unproved Properties	$ 114,000,000
Capitalized Costs Proved Properties	297,000,000					$ 1,900,000,000
Inventories Acquired	20,000,000	$ 42,000,000
Investments and long-term receivables	14,000,000					15,000,000
Net Working Capital						(100,000,000)
Kuparuk Assets [Member] | Alaska Segment [Member] | Operating Segments [Member] | Asset Retirement Obligation Costs [Member]
Business Combinations [Abstract]
Asset Retirement Obligation	$ 59,000,000					$ 374,000,000

Investments, Loans and LT Recei

Investments, Loans and LT Receivables Components (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Summary of Investment Holdings [Line Items]
Equity investments	$ 7,596	$ 8,234
Loans and advances-related parties	114	219
Long-term receivables	137	243
Other investments	67	77
Total	8,131	8,906
Other Long-term Investments [Member]
Summary of Investment Holdings [Line Items]
Investments in long-term debt securities	$ 217	$ 133

Investments, Loans and LT Rec_2

Investments, Loans and LT Receivables - Financial Info (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity Method Investment, Summarized Financial Information [Line Items]
Total Revenues and Other Income	$ 19,256	$ 36,670	$ 38,727
Net income (loss)	(2,655)	7,257	6,305
Total Current Assets	12,066	16,913
Total Current Liabilities	5,366	7,043
Affiliated Companies [Member]
Equity Method Investment, Summarized Financial Information [Line Items]
Total Revenues and Other Income	7,931	11,310	11,654
Income (loss) before income taxes	1,843	3,726	3,660
Net income (loss)	1,426	3,085	$ 3,244
Total Current Assets	2,579	3,289
Noncurrent assets	35,257	38,905
Total Current Liabilities	2,110	2,603
Noncurrent liabilities	$ 18,099	$ 22,168

Investments, Loans and LT Rec_3

Investments, Loans and LT Receivables Textuals (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2012
Equity Method Investment, Summarized Financial Information [Line Items]
Retained Earning Equity Method				$ 41
Equity Method Investment Dividends				1,076	$ 1,378	$ 1,226
Letters of Credit [Abstract]
Book value of equity method investment				7,596	8,234
Income (Loss) From Equity Method Investments				$ 432	779	1,074
Australia Pacific LNG [Member]
Equity Method Investment, Summarized Financial Information [Line Items]
Ownership percentage in equity investment				37.50%
Equity method investments, fair value				$ 6,560
Letters of Credit [Abstract]
Total amount under revolving credit facilities							$ 8,500
Line of Credit Facility, Frequency of Payments				bi-annual
Balance Outstanding On Credit Facility				$ 6,200
Long Term Debt Refinanced Amount			$ 3,200
Equity Method Investment, Other than Temporary Impairment				112
Book value of equity method investment				6,672
Historical cost basis				6,242
Difference between estimated value and book value of equity method investment				430
Amortizable portion of the basis difference in PPE				$ 41	$ 36	$ 44
Australia Pacific LNG [Member] | Export-Import Bank of US [Member]
Letters of Credit [Abstract]
Total amount under revolving credit facilities							2,900
Australia Pacific LNG [Member] | Export-Import Bank of China [Member]
Letters of Credit [Abstract]
Total amount under revolving credit facilities							2,700
Early Repayment of Senior Debt	$ 1,400		1,000
Line of Credit Facility, Frequency of Payments				bi-annual
Australia Pacific LNG [Member] | U S Private Placement Bond [Member]
Letters of Credit [Abstract]
Total amount under revolving credit facilities	$ 1,400
Australia Pacific LNG [Member] | Australian and International Commercial Bank Syndicate [Member]
Letters of Credit [Abstract]
Total amount under revolving credit facilities							$ 2,900
Early Repayment of Senior Debt			$ 2,200
Australia Pacific LNG [Member] | Commerical Banks [Member]
Letters of Credit [Abstract]
Line of Credit Facility, Frequency of Payments		bi-annual
Long Term Debt Refinanced Amount		$ 2,600
Australia Pacific LNG [Member] | U S Private Placement Bond Two [Member]
Letters of Credit [Abstract]
Total amount under revolving credit facilities		$ 600
Line of Credit Facility, Frequency of Payments		bi-annual
Australia Pacific LNG [Member] | Origin Energy [Member]
Equity Method Investment, Summarized Financial Information [Line Items]
Ownership percentage in equity investment				37.50%
Australia Pacific LNG [Member] | Sinopec [Member]
Equity Method Investment, Summarized Financial Information [Line Items]
Ownership percentage in equity investment				25.00%
QG3
Equity Method Investment, Summarized Financial Information [Line Items]
Ownership percentage in equity investment				30.00%
Letters of Credit [Abstract]
Total amount under revolving credit facilities				$ 4,000
Line of Credit Facility, Frequency of Payments				Semi-annual
Book value of equity method investment				$ 742
Loans to related parties				220
QG3 | Credit Agencies [Member]
Letters of Credit [Abstract]
Total amount under revolving credit facilities				1,300
QG3 | Commerical Banks [Member]
Letters of Credit [Abstract]
Total amount under revolving credit facilities				1,500
QG3 | ConocoPhillips [Member]
Letters of Credit [Abstract]
Total amount under revolving credit facilities				$ 1,200
QG3 | Mitsui & Co, Ltd. [Member]
Equity Method Investment, Summarized Financial Information [Line Items]
Ownership percentage in equity investment				1.50%
QG3 | Qatar Petroleum [Member]
Equity Method Investment, Summarized Financial Information [Line Items]
Ownership percentage in equity investment				68.50%
QG3 | Other Affiliates [Member]
Letters of Credit [Abstract]
Loans to related parties				$ 220
Golden Pass [Member]
Equity Method Investment, Summarized Financial Information [Line Items]
Ownership percentage in equity investment				12.40%

Investment in Cenovus Energy (D

Investment in Cenovus Energy (Details) - USD ($)		3 Months Ended	5 Months Ended	12 Months Ended
		Dec. 31, 2018	May 17, 2017	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 04, 2021
Schedule of Available-for-sale Securities [Line Items]
Investment in Cenovus Energy				$ 1,256,000,000	$ 2,111,000,000
Unrealized (gain) loss on investment in Cenovus Energy				(855,000,000)	649,000,000	$ (437,000,000)
Unrealized Gain (Loss) on Securities, before tax	[1]			$ (855,000,000)	649,000,000	$ (437,000,000)
Foster Creek Christina Lake (FCCL) [Member]
Schedule of Available-for-sale Securities [Line Items]
Ownership percentage in equity investment			50.00%
Common Stock [Member] | Cenovus Energy [Member]
Schedule of Available-for-sale Securities [Line Items]
Shares Exchanged for Assets Held for Sale			208,000,000	208,000,000
Investment Owned, Common Stock, percent of Issued and Outstanding			16.90%				10.00%
Investment in Cenovus Energy			$ 1,960,000,000
Investment In Equity Security Fair Value				$ 1,260,000,000	2,110,000,000
Cenovus Energy common share price			$ 9.41	$ 6.04
Unrealized Gain (Loss) on Securities, before tax		$ (437,000,000)			$ 649,000,000
[1]	*See Note 6—Investment in Cenovus Energy, for additional information.

Suspended Wells Net Changes in

Suspended Wells Net Changes in Well Costs (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Net changes in suspended Exploratory well costs
Beginning balance	$ 1,020,000,000	[1]	$ 856,000,000		$ 853,000,000
Additions pending the determination of proved reserves	164,000,000		239,000,000		140,000,000
Reclassifications to proved properties	(42,000,000)		(11,000,000)		(37,000,000)
Sales of suspended wells	(313,000,000)		(54,000,000)		(93,000,000)
Charged to dry hole expense	(147,000,000)		(10,000,000)		(7,000,000)
Ending balance	$ 682,000,000		$ 1,020,000,000	[1]	$ 856,000,000
[1]	*Includes $ 313

Suspended Wells Changes in Well

Suspended Wells Changes in Well Costs Narrative (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017
Capitalized Exploratory Well Costs	$ 682,000,000	$ 1,020,000,000	[1]	$ 856,000,000	$ 853,000,000
AUSTRALIA
Capitalized Exploratory Well Costs		$ 313,000,000
[1]	*Includes $ 313

Suspended Wells - Aging of susp

Suspended Wells - Aging of suspended well balances (Details)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)		Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Aging of suspended well cost
Exploratory well costs capitalized for a period of one year or less	$ 156,000,000	$ 206,000,000		$ 145,000,000
Exploratory well costs capitalized for a period greater than one year	526,000,000	814,000,000		711,000,000
Ending balance	$ 682,000,000	$ 1,020,000,000	[1]	$ 856,000,000	$ 853,000,000
Number of projects that have exploratory well costs that have been capitalized for a period greater than one year	22	23		24
[1]	*Includes $ 313

Suspended Wells-Exploratory Cap

Suspended Wells-Exploratory Capitalized Well Costs (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	$ 526	$ 814	$ 711
2016 - 2018 [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	311
2013 - 2015 [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	109
2004 - 2012 [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	106
NPR-A-Alaska [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	240
NPR-A-Alaska [Member] | 2016 - 2018 [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	190
NPR-A-Alaska [Member] | 2013 - 2015 [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	50
NPR-A-Alaska [Member] | 2004 - 2012 [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	0
Surmont - Canada
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	120
Surmont - Canada | 2016 - 2018 [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	4
Surmont - Canada | 2013 - 2015 [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	31
Surmont - Canada | 2004 - 2012 [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	85
Narwhal Trend Alaska [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	52
Narwhal Trend Alaska [Member] | 2016 - 2018 [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	52
Narwhal Trend Alaska [Member] | 2013 - 2015 [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	0
Narwhal Trend Alaska [Member] | 2004 - 2012 [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	0
Kamunsu East-Malaysia
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	22
Kamunsu East-Malaysia | 2016 - 2018 [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	22
Kamunsu East-Malaysia | 2013 - 2015 [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	0
Kamunsu East-Malaysia | 2004 - 2012 [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	0
WL4-00-Malaysia
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	17
WL4-00-Malaysia | 2016 - 2018 [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	17
WL4-00-Malaysia | 2013 - 2015 [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	0
WL4-00-Malaysia | 2004 - 2012 [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	0
NC 98-Libya
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	13
NC 98-Libya | 2016 - 2018 [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	0
NC 98-Libya | 2013 - 2015 [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	9
NC 98-Libya | 2004 - 2012 [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	4
Other Projects [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	62
Other Projects [Member] | 2016 - 2018 [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	26
Other Projects [Member] | 2013 - 2015 [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	19
Other Projects [Member] | 2004 - 2012 [Member]
Aging of exploratory well costs that have been capitalized for more than one year
Aging of Exploratory Well Cost that have been capitalized for more than one year	$ 17

Suspended Wells-Exploration Exp

Suspended Wells-Exploration Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Exploration Expense	$ 1,457	$ 743	$ 369
Lower 48 Segment [Member]
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Exploration Expense		141
Lower 48 Segment [Member] | Central Louisiana Austin Chalk [Member]
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Exploration Expense		$ 111
Lower 48 Segment [Member] | Alaska North Slope Gas [Member]
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Exploration Expense	828
Other International Segment [Member]
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Exploration Expense	84
Asia Pacific [Member]
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Exploration Expense	$ 50

Impairments (Details)

Impairments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Asset Impairment Charges	$ 813	$ 405	$ 27
Alaska Segment [Member] | Operating Segments [Member]
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Asset Impairment Charges	0	0	20
Lower 48 Segment [Member]
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Asset Impairment Charges	813
Lower 48 Segment [Member] | Operating Segments [Member]
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Asset Impairment Charges	804	402	63
Canada Segment [Member] | Operating Segments [Member]
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Asset Impairment Charges	3	2	9
Europe, Middle East, And North Africa [Member] | Operating Segments [Member]
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Asset Impairment Charges	6	1	(79)
Asia Pacific [Member] | Operating Segments [Member]
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Asset Impairment Charges	$ 0	$ 0	$ 14

Impairments Narratives (Details

Impairments Narratives (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Asset Impairment Charges			$ 813	$ 405	$ 27
Exploration Expense			1,457	743	369
Alaska Segment [Member] | Operating Segments [Member]
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Asset Impairment Charges			0	0	20
Alaska Segment [Member] | Cancelled Project [Member]
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Asset Impairment Charges					20
Lower 48 Segment [Member]
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Asset Impairment Charges			813
Exploration Expense				141
Lower 48 Segment [Member] | Operating Segments [Member]
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Asset Impairment Charges			804	402	63
Lower 48 Segment [Member] | Niobrara [Member]
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Asset Impairment Charges				402
Lower 48 Segment [Member] | Central Louisiana Austin Chalk [Member]
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Exploration Expense				111
Lower 48 Segment [Member] | Barnett [Member]
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Asset Impairment Charges					63
Lower 48 Segment [Member] | Wind River Basin [Member]
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Asset Impairment Charges	$ 287	$ 523
Canada Segment [Member] | Operating Segments [Member]
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Asset Impairment Charges			3	$ 2	9
Europe and North Africa Segment [Member] | Certain Projects In Europe And NorthAfrica [Member]
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Asset Impairment Charges					$ (79)
Other International Segment [Member]
Impaired Assets to be Disposed of by Method Other than Sale [Line Items]
Exploration Expense			$ 84

Asset Retirement Obligations _3

Asset Retirement Obligations and Accrued Environmental Costs (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Environmental Liabilities [Line Items]
Asset retirement obligations	$ 5,573	$ 6,206	$ 7,908
Accrued environmental costs	180	171
Total asset retirement obligations and accrued environmental costs	5,753	6,377
Asset retirement obligations and accrued environmental costs due within one year	323	1,025
Long-term asset retirement obligations and accrued environmental costs	$ 5,430	5,352
Other accruals
Environmental Liabilities [Line Items]
Asset retirement obligations and accrued environmental costs due within one year		$ (741)

Asset Retirement Obligations _4

Asset Retirement Obligations and Accrued Environmental Costs - Change in Asset Retirement Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Changes in overall asset retirement obligation changed
Balance at January 1	$ 6,206	$ 7,908
Accretion of discount	248	322
New obligations	262	155
Changes in estimates of existing obligations	(307)	50
Spending on existing obligations	(116)	(229)
Property dispositions	(771)	(1,920)
Foreign currency translation	51	(80)
Balance at December 31	$ 5,573	$ 6,206

Asset Retirement Obligations _5

Asset Retirement Obligations and Accrued Environmental Costs - Textuals (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Environmental Liabilities [Line Items]
Accrued environmental costs	$ 180	$ 171
Accrued Enviornmental Costs Discounted	$ 106
Maximum number of years accrued environmental liabilities will be paid over	30 years
Expected expenditures for acquired environmental obligations, weighted-average discount factor rate	5.00%
Accrued environmental costs, undiscounted due 2021	$ 23
Accrued environmental costs, undiscounted due 2022	17
Accrued environmental costs, undiscounted due 2023	18
Accrued environmental costs, undiscounted due 2024	3
Accrued environmental costs, undiscounted due 2025	2
Accrued environmental costs, undiscounted due after 2026	103
Cleanup Remediation Activities [Member]
Environmental Liabilities [Line Items]
Accrued environmental costs	116	112
Corporate and Other Environmental Liabilities [Member]
Environmental Liabilities [Line Items]
Accrued environmental costs	48	47
Federal Comprehensive Environmental Response Compensation and Liability Act or Similar State Laws [Member]
Environmental Liabilities [Line Items]
Accrued environmental costs	$ 16	$ 12

Debt (Details)

Debt (Details) - USD ($) $ in Millions	Dec. 31, 2020		Dec. 31, 2019
Long-term debt
Debt Instrument, Face Amount	$ 14,292		$ 13,971
Finance Lease Obligations	891		720
Net unamortized premiums and discounts	186		204
Total debt	15,369		14,895
Short-term debt	(619)		(105)
Long-term debt	14,750		14,790
Variable rate debt bonds [Member]
Long-term debt
Debt Instrument, Face Amount	283		283
9.125% Debentures [Member] | Due 2021 [Member] | Unsecured Debt (Debentures) [Member]
Long-term debt
Debt Instrument, Face Amount	$ 123		123
Debt Instrument, Interest Rate, Stated Percentage	9.125%
8.20% Debentures [Member] | Due 2025 [Member] | Unsecured Debt (Debentures) [Member]
Long-term debt
Debt Instrument, Face Amount	$ 134		134
Debt Instrument, Interest Rate, Stated Percentage	8.20%
8.125% Notes [Member] | Due 2030 [Member] | Notes Payable To Banks [Member]
Long-term debt
Debt Instrument, Face Amount	$ 390		390
Debt Instrument, Interest Rate, Stated Percentage	8.125%
7.9% Debentures [Member] | Due 2047 [Member] | Notes Payable To Banks [Member]
Long-term debt
Debt Instrument, Face Amount	$ 60		60
Debt Instrument, Interest Rate, Stated Percentage	7.90%
7.8% Debentures [Member] | Due 2027 [Member] | Unsecured Debt (Debentures) [Member]
Long-term debt
Debt Instrument, Face Amount	$ 203		203
Debt Instrument, Interest Rate, Stated Percentage	7.80%
7.65% Debentures [Member] | Due 2023 [Member] | Unsecured Debt (Debentures) [Member]
Long-term debt
Debt Instrument, Face Amount	$ 78		78
Debt Instrument, Interest Rate, Stated Percentage	7.65%
7.40% Notes [Member] | Due 2031 [Member] | Notes Payable To Banks [Member]
Long-term debt
Debt Instrument, Face Amount	$ 500		500
Debt Instrument, Interest Rate, Stated Percentage	7.40%
7.375% Debentures [Member] | Due 2029 [Member] | Unsecured Debt (Debentures) [Member]
Long-term debt
Debt Instrument, Face Amount	$ 92		92
Debt Instrument, Interest Rate, Stated Percentage	7.375%
7.25% Notes [Member] | Due 2031 [Member] | Notes Payable To Banks [Member]
Long-term debt
Debt Instrument, Face Amount	$ 500		500
Debt Instrument, Interest Rate, Stated Percentage	7.25%
7.20% Notes [Member] | Due 2031 [Member] | Notes Payable To Banks [Member]
Long-term debt
Debt Instrument, Face Amount	$ 575		575
Debt Instrument, Interest Rate, Stated Percentage	7.20%
7% Debentures [Member] | Due 2029 [Member] | Unsecured Debt (Debentures) [Member]
Long-term debt
Debt Instrument, Face Amount	$ 200		200
Debt Instrument, Interest Rate, Stated Percentage	7.00%
6.95% Notes [Member] | Due 2029 [Member] | Notes Payable To Banks [Member]
Long-term debt
Debt Instrument, Face Amount	$ 1,549		1,549
Debt Instrument, Interest Rate, Stated Percentage	6.95%
6.875% Debentures [Member] | Due 2026 [Member] | Unsecured Debt (Debentures) [Member]
Long-term debt
Debt Instrument, Face Amount	$ 67		67
Debt Instrument, Interest Rate, Stated Percentage	6.875%
6.50% Notes [Member] | Due 2039 [Member] | Notes Payable To Banks [Member]
Long-term debt
Debt Instrument, Face Amount	$ 2,750		2,750
Debt Instrument, Interest Rate, Stated Percentage	6.50%
5.951% Notes [Member] | Due 2037 [Member] | Notes Payable To Banks [Member]
Long-term debt
Debt Instrument, Face Amount	$ 645		645
Debt Instrument, Interest Rate, Stated Percentage	5.951%
5.95% Notes [Member] | Due 2036 [Member] | Notes Payable To Banks [Member]
Long-term debt
Debt Instrument, Face Amount	$ 500		500
Debt Instrument, Interest Rate, Stated Percentage	5.95%
5.95% Notes [Member] | Due 2046 [Member] | Notes Payable To Banks [Member]
Long-term debt
Debt Instrument, Face Amount	$ 500		500
Debt Instrument, Interest Rate, Stated Percentage	5.95%
5.90% Notes [Member] | Due 2032 [Member] | Notes Payable To Banks [Member]
Long-term debt
Debt Instrument, Face Amount	$ 505		505
Debt Instrument, Interest Rate, Stated Percentage	5.90%
5.90% Notes [Member] | Due 2038 [Member] | Notes Payable To Banks [Member]
Long-term debt
Debt Instrument, Face Amount	$ 600		600
Debt Instrument, Interest Rate, Stated Percentage	5.90%
4.95% Notes [Member] | Due 2026 [Member] | Notes Payable To Banks [Member]
Long-term debt
Debt Instrument, Face Amount	$ 1,250		1,250
Debt Instrument, Interest Rate, Stated Percentage	4.95%
4.3% Notes [Member] | Due 2044 [Member] | Notes Payable To Banks [Member]
Long-term debt
Debt Instrument, Face Amount	$ 750		750
Debt Instrument, Interest Rate, Stated Percentage	4.30%
4.15% Notes [Member] | Due 2034 [Member] | Notes Payable To Banks [Member]
Long-term debt
Debt Instrument, Face Amount	$ 246		246
Debt Instrument, Interest Rate, Stated Percentage	4.15%
3.35% Notes [Member] | Due 2024 [Member] | Notes Payable To Banks [Member]
Long-term debt
Debt Instrument, Face Amount	$ 426		426
Debt Instrument, Interest Rate, Stated Percentage	3.35%
3.35% Notes [Member] | Due 2025 [Member] | Notes Payable To Banks [Member]
Long-term debt
Debt Instrument, Face Amount	$ 199		199
Debt Instrument, Interest Rate, Stated Percentage	3.35%
2.4% Notes [Member] | Due 2022 [Member] | Notes Payable To Banks [Member]
Long-term debt
Debt Instrument, Face Amount	$ 329		329
Debt Instrument, Interest Rate, Stated Percentage	2.40%
Floating rate note due 2018 [Member] | Due 2018 [Member] | Floating Rate Notes [Member]
Long-term debt
Debt Instrument, Face Amount	$ 500		$ 500
Floating Rate Notes Due 2022 [Member] | Floating Rate Notes [Member] | Minimum [Member]
Long-term debt
Debt Instrument, Interest Rate, Stated Percentage	1.12%		2.81%
Floating Rate Notes Due 2022 [Member] | Floating Rate Notes [Member] | Maximum [Member]
Long-term debt
Debt Instrument, Interest Rate, Stated Percentage	2.81%		3.58%
Marine Terminal Revenue Refunding Bonds [Member] | Variable rate debt bonds [Member] | Minimum [Member]
Long-term debt
Debt Instrument, Interest Rate, Stated Percentage	0.10%	[1]	1.08%
Marine Terminal Revenue Refunding Bonds [Member] | Variable rate debt bonds [Member] | Maximum [Member]
Long-term debt
Debt Instrument, Interest Rate, Stated Percentage	7.50%		2.45%
Marine Terminal Revenue Refunding Bonds [Member] | Due 2031 [Member] | Variable rate debt bonds [Member]
Long-term debt
Debt Instrument, Face Amount	$ 18		$ 18
Commercial Paper due 2020 [Member] | Due 2020 [Member] | Commercial Paper, Variable Rate [Member]
Long-term debt
Debt Instrument, Face Amount	$ 300
Commercial Paper due 2020 [Member] | Due 2020 [Member] | Commercial Paper, Variable Rate [Member] | Minimum [Member]
Long-term debt
Debt Instrument, Interest Rate, Stated Percentage	8.00%
Commercial Paper due 2020 [Member] | Due 2020 [Member] | Commercial Paper, Variable Rate [Member] | Maximum [Member]
Long-term debt
Debt Instrument, Interest Rate, Stated Percentage	23.00%
Industrial Development Bonds Due One [Member] | Variable rate debt bonds [Member]
Long-term debt
Debt Instrument, Face Amount	$ 265		$ 265
Industrial Development Bonds Due One [Member] | Variable rate debt bonds [Member] | Minimum [Member]
Long-term debt
Debt Instrument, Interest Rate, Stated Percentage	0.11%		1.08%
Industrial Development Bonds Due One [Member] | Variable rate debt bonds [Member] | Maximum [Member]
Long-term debt
Debt Instrument, Interest Rate, Stated Percentage	7.50%		2.45%
Other Debt [Member] | Unsecured Debt (Debentures) [Member]
Long-term debt
Debt Instrument, Face Amount	$ 38		$ 17
[1]	<div>Plans for which ConocoPhillips is not the primary obligor—primarily those administered by equity affiliates.</div>

Debt Narratives (Details)

Debt Narratives (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Feb. 04, 2021	Jan. 15, 2021	Sep. 30, 2020
Debt (Textual) [Abstract]
Maturities of long-term borrowings in 2021	$ 619,000,000
Maturities of long-term borrowings in 2022	1,001,000,000
Maturities of long-term borrowings in 2023	259,000,000
Maturities of long-term borrowings in 2024	579,000,000
Maturities of long-term borrowings in 2025	465,000,000
Short-term Debt [Line Items]
Letters of Credit Outstanding, Amount	249,000,000
Debt Instrument [Line Items]
Debt Instrument, Face Amount	14,292,000,000	$ 13,971,000,000
Repayment of Debt	254,000,000	80,000,000	$ 4,995,000,000
Subsequent Event [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt					$ 3,900,000,000
Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Total amount under revolving credit facilities	6,000,000,000
Commercial paper program	$ 6,000,000,000
Maturity period of commercial paper (in days)	P90D
Minimum limit of debt for cross default provision	$ 200,000,000
Letters of Credit Outstanding, Amount	0	0
Commercial paper outstanding		0
Line of Credit Facility, Remaining Borrowing Capacity	5,700,000,000
Letter Of Credit [Member]
Short-term Debt [Line Items]
Letters of credit capacity	500,000,000
Letters of Credit Outstanding, Amount		0
Subsequent Event [Member] | Concho Resources Inc [Member]
Subsequent Event [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt					$ 4,700,000,000
Notes offered in exchange				$ 3,900,000,000
Percent of notes offered tendered and exchanged for new debt				98.00%
Tendered and exchanged notes for new debt				$ 3,800,000,000
Unsecured Debt (Debentures) [Member] | Due 2021 [Member] | 9.125% Debentures [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	123,000,000	123,000,000
Unsecured Debt (Debentures) [Member] | Due 2023 [Member] | 7.65% Debentures [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	78,000,000	78,000,000
Unsecured Debt (Debentures) [Member] | Due 2025 [Member] | 8.20% Debentures [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	134,000,000	134,000,000
Unsecured Debt (Debentures) [Member] | Due 2027 [Member] | 7.8% Debentures [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	203,000,000	203,000,000
Floating Rate Notes [Member] | Due 2018 [Member] | Floating rate note due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	500,000,000	500,000,000
Variable rate debt bonds [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	283,000,000	283,000,000
ConocoPhilips Commerical Paper Program [Member] | Commercial Paper [Member]
Short-term Debt [Line Items]
Letters of Credit Outstanding, Amount	$ 300,000,000	$ 0				$ 300,000,000

Guarantees Textual (Details)

Guarantees Textual (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)
Australia Pacific LNG [Member]
Guarantor Obligations [Line Items]
Equity Interest Of Others	37.50%
Continued development [Member] | Australia Pacific LNG [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 130
Terms of Guarantees Outstanding	16 to 25 years or the life of the venture
Guarantor Obligations, Current Carrying Value	$ 7
Other Guarantees [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 730
Terms of Guarantees Outstanding	P6Y
Guarantor Obligations, Current Carrying Value	$ 11
Indemnification [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Current Carrying Value	50
Guarantee existing sales agreement of natural gas delivery | Australia Pacific LNG [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 770
Terms of Guarantees Outstanding	1 to 21 years
Max potential future payments-reckless breach [Member] | Australia Pacific LNG [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 1,400
Finance Reserve Guarantee [Member] | Australia Pacific LNG [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 170
Terms of Guarantees Outstanding	P10Y
Guarantor Obligations, Current Carrying Value	$ 14

Contingencies and Commitments (

Contingencies and Commitments (Details) - USD ($) $ in Millions	1 Months Ended				3 Months Ended	12 Months Ended
	Jul. 31, 2020	Aug. 31, 2019	Mar. 31, 2019	Apr. 30, 2018	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Aug. 29, 2019
Loss Contingencies [Line Items]
Letters of Credit Outstanding, Amount						$ 249
Long-Term Throughput Agreements and Take-or-Pay Agreements [Abstract]
Payments under Long-Term Throughput Agreements And Take-or-Pay Agreements, Due within one year						7
Payments under Long-Term Throughput Agreements And Take-or-Pay Agreements, Due in Second Year						7
Payments under Long-Term Throughput Agreements And Take-or-Pay Agreements, Due in Third Year						7
Payments under Long-Term Throughput Agreements And Take-or-Pay Agreements, Due in Fourth Year						7
Payments under Long-Term Throughput Agreements And Take-or-Pay Agreements, Due in Fifth Year						7
Payments under Long-Term Throughput Agreements And Take-or-Pay Agreements, Due after Fifth Year						51
Total payments under Long-Term Throughput Agreements and Take-or-Pay Agreements						$ 25	$ 25	$ 39
Burlington Resources Inc Vs The Republic Of Ecuador [Member]
Loss Contingencies [Line Items]
Cash Proceeds from Legal Settlements								262
ConocoPhillips Vs Petroleos de Venezuela SA [Member]
Loss Contingencies [Line Items]
Cash Proceeds from Legal Settlements							$ 330	$ 430
ConocoPhillips Vs Petroleos de Venezuela SA [Member] | Venezuela
Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded from Other Party			$ 8,700
Litigation Settlement Amount Awarded From Other Party Revised									$ 8,500
Litigation Award Reduction									$ 227
Loss Contingency Settlement Agreement Terms						under their agreements in connection with the expropriation of the projects and other pre-expropriation fiscal measures. In August 2018, ConocoPhillips entered into a settlement with PDVSA to recover the full amount of this ICC award, plus interest through the payment period, including initial payments totaling approximately $500 million within a period of 90 days from the time of signing of the settlement agreement. The balance of the settlement is to be paid quarterly over a period of four and a half years.
ConocoPhillips Versus Petroleos De Venezuela 2 [Member] | Venezuela
Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded from Other Party				$ 2,000
Cash Proceeds from Legal Settlements						$ 754
Conoco Phillips Versus Petroleos DeVenezuela 3 [Member] | Venezuela
Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded from Other Party		$ 33
Several Louisiana parishes and the State of Louisiana against oil and gas companies [Member] | The Louisiana Land And Exploration Company LLC [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded from Other Party	$ 90
Cash Proceeds from Legal Settlements					$ 90

Derivative and Financial Inst_3

Derivative and Financial Instruments - Commodity Balance Sheet (Details) - Commodity Contract [Member] - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Commodity derivative assets	$ 229	$ 288
Other assets [Member]
Derivatives, Fair Value [Line Items]
Commodity derivative assets	26	34
Other accruals [Member]
Derivatives, Fair Value [Line Items]
Commodity derivative liabilities	202	283
Other liabilities and deferred credits [Member]
Derivatives, Fair Value [Line Items]
Commodity derivative liabilities	$ 18	$ 28

Derivative and Financial Inst_4

Derivative and Financial Instruments - Commodity GainLoss (Details) - Commodity Contract [Member] - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Sales and other operating revenues [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) from commodity derivatives	$ 19,000,000	$ 141,000,000	$ 45,000,000
Other Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) from commodity derivatives	4,000,000	4,000,000	7,000,000
Purchased commodities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) from commodity derivatives	$ 11,000,000	$ (118,000,000)	$ (41,000,000)

Derivative and Financial Inst_5

Derivative and Financial Instruments - Commodity Notional (Details) - Commodity Contract [Member] - Short [Member] - Bcfe Bcfe in Billions	Dec. 31, 2020	Dec. 31, 2019
Natural gas and power, Fixed price [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Commodity derivatives - volumetric material net exposures	(20)	(5)
Natural gas and power, Basis [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Commodity derivatives - volumetric material net exposures	(10)	(23)

Derivative and Financial Inst_6

Derivative and Financial Instruments - FX Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Foreign currency exchange derivative assets	$ 2	$ 1
Other accruals [Member]
Derivatives, Fair Value [Line Items]
Foreign currency exchange derivative liabilities	16	20
Other liabilities and deferred credits [Member]
Derivatives, Fair Value [Line Items]
Foreign currency exchange derivative liabilities	$ 0	$ 8

Derivative and Financial Inst_7

Derivative and Financial Instruments - FX Derivative (Details)	12 Months Ended
	Dec. 31, 2020
Derivative and Financial Instruments [Abstract]
Description of Foreign Currency Derivative Instruments Not Designated as Hedging Instruments Activities	At December 31, 2020, we had outstanding foreign currency exchange forward contracts to sell $0.45 billion CAD at $0.748 CAD against the U.S. dollar. At December 31, 2019, we had outstanding foreign currency exchange forward contracts to sell $1.35 billion CAD at $0.748 CAD against the U.S. dollar

Derivative and Financial Inst_8

Derivative and Financial Instruments - FX GainLoss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Foreign currency transaction (gains) losses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Foreign currency transaction (gains) losses	$ (40)	$ 16	$ 1

Derivative and Financial Inst_9

Derivative and Financial Instruments - FX Notional (Details) £ in Millions, $ in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2020CAD ($)	Dec. 31, 2020GBP (£)	Dec. 31, 2020USD ($)	Dec. 31, 2019CAD ($)	Dec. 31, 2019GBP (£)	Dec. 31, 2019USD ($)
Trading Activity, Gains and Losses, Net [Line Items]
Description of Foreign Currency Derivative Instruments Not Designated as Hedging Instruments Activities		At December 31, 2020, we had outstanding foreign currency exchange forward contracts to sell $0.45 billion CAD at $0.748 CAD against the U.S. dollar. At December 31, 2019, we had outstanding foreign currency exchange forward contracts to sell $1.35 billion CAD at $0.748 CAD against the U.S. dollar
Sell U.S. dollar, buy British pound. | Not Designated as Hedging Instrument [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Net notional position of foreign currency exchange derivatives							$ 0
Sell British pound, buy other currencies [Member] | Not Designated as Hedging Instrument [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Net notional position of foreign currency exchange derivatives | £	[1]					£ 0
Buy British Pound Sell Euro [Member] | Not Designated as Hedging Instrument [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Net notional position of foreign currency exchange derivatives | £			£ 0			£ 4
Sell British Pound, Buy Euro [Member] | Not Designated as Hedging Instrument [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Net notional position of foreign currency exchange derivatives				$ 5			$ 0
Sell Canadian dollar, buy U.S. dollar [Member] | Not Designated as Hedging Instrument [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Net notional position of foreign currency exchange derivatives		$ 370			$ 1,337
[1]	<div>0</div>

Derivative and Financial Ins_10

Derivative and Financial Instruments - Financial Instruments Cost (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Cash and Cash Equivalents, carried at cost plus accrued interest	$ 2,978	$ 5,079
Short-term investments carried at cost plus accrued interest	3,320	2,929
Investments and long-term receivables carried at cost plus accrued interest	1	0
Cash [Member]
Schedule of Held-to-maturity Securities [Line Items]
Cash and Cash Equivalents, carried at cost plus accrued interest	597	759
Demand Deposits [Member]
Schedule of Held-to-maturity Securities [Line Items]
Cash and Cash Equivalents, carried at cost plus accrued interest	1,133	1,483
Bank Time Deposits [Member] | Remaining maturities 1 To 90 Days [Member]
Schedule of Held-to-maturity Securities [Line Items]
Cash and Cash Equivalents, carried at cost plus accrued interest	1,225	2,030
Short-term investments carried at cost plus accrued interest	2,859	1,395
Bank Time Deposits [Member] | Remaining maturities from 91 to 180 days [Member]
Schedule of Held-to-maturity Securities [Line Items]
Short-term investments carried at cost plus accrued interest	448	465
Bank Time Deposits [Member] | Remaining maturities within one year [Member]
Schedule of Held-to-maturity Securities [Line Items]
Short-term investments carried at cost plus accrued interest	13	0
Bank Time Deposits [Member] | Remaining maturities greater than one year through five years [Member]
Schedule of Held-to-maturity Securities [Line Items]
Investments and long-term receivables carried at cost plus accrued interest	1	0
Commercial Paper [Member] | Remaining maturities 1 To 90 Days [Member]
Schedule of Held-to-maturity Securities [Line Items]
Cash and Cash Equivalents, carried at cost plus accrued interest	0	413
Short-term investments carried at cost plus accrued interest	0	1,069
US Government Debt Securities [Member] | Remaining maturities 1 To 90 Days [Member]
Schedule of Held-to-maturity Securities [Line Items]
Cash and Cash Equivalents, carried at cost plus accrued interest	23	394
Short-term investments carried at cost plus accrued interest	$ 0	$ 0

Derivative and Financial Ins_11

Derivative and Financial Instruments - Financial Instruments Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Remaining maturities within one year [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, carried at fair value	$ 13	$ 9
Short Term Investments At Fair Value	289	99
Remaining maturities greater than one year through five years [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments and Long Term Receivable Carried At Fair Value	216	133
Corporate Debt [Member] | Remaining maturities within one year [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, carried at fair value	0	1
Short Term Investments At Fair Value	130	59
Corporate Debt [Member] | Remaining maturities greater than one year through five years [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments and Long Term Receivable Carried At Fair Value	143	99
Commercial Paper [Member] | Remaining maturities within one year [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, carried at fair value	13	8
Short Term Investments At Fair Value	155	30
US Government Debt Securities [Member] | Remaining maturities within one year [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, carried at fair value	0	0
Short Term Investments At Fair Value	4	10
US Government Debt Securities [Member] | Remaining maturities greater than one year through five years [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments and Long Term Receivable Carried At Fair Value	13	15
US Government Agencies Obligations [Member] | Remaining maturities greater than one year through five years [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments and Long Term Receivable Carried At Fair Value	17	0
Foreign Government Debt [Member] | Remaining maturities greater than one year through five years [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments and Long Term Receivable Carried At Fair Value	2	0
Asset-backed Securities [Member] | Remaining maturities within one year [Member]
Schedule of Available-for-sale Securities [Line Items]
Short Term Investments At Fair Value	0	0
Asset-backed Securities [Member] | Remaining maturities greater than one year through five years [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments and Long Term Receivable Carried At Fair Value	$ 41	$ 19

Derivative and Financial Ins_12

Derivative and Financial Instruments - Cost Basis to Fair Value (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	$ 516	$ 241
Investments, Fair Value Disclosure	518	241
Proceeds from sales and redemptions of investments in debt securities classified as available for sale	422
Corporate Debt [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	271	159
Investments, Fair Value Disclosure	273	159
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	168	38
Investments, Fair Value Disclosure	168	38
US Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	17	25
Investments, Fair Value Disclosure	17	25
US Government Agencies Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	17	0
Investments, Fair Value Disclosure	17	0
Foreign Government Debt [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	2	0
Investments, Fair Value Disclosure	2	0
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	41	19
Investments, Fair Value Disclosure	$ 41	$ 19

Derivative and Financial Ins_13

Derivative and Financial Instruments - Credit Risk (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Schedule of Credit Risk [Line Items]
Collateral was posted for derivative instruments in a liability position	$ 0	$ 0
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Credit Derivative, Recourse Provisions	Certain of our derivative instruments contain provisions that require us to post collateral if the derivative exposure exceeds a threshold amount. We have contracts with fixed threshold amounts and other contracts with variable threshold amounts that are contingent on our credit rating. The variable threshold amounts typically decline for lower credit ratings, while both the variable and fixed threshold amounts typically revert to zero if we fall below investment grade. Cash is the primary collateral in all contracts; however, many also permit us to post letters of credit as collateral, such as transactions administered through the New York Mercantile Exchange.
In event of lowered credit rating [Member]
Schedule of Credit Risk [Line Items]
Derivative, Net Liability Position, Aggregate Fair Value	$ 25	$ 79
In event of downgrade below investment grade [Member]
Schedule of Credit Risk [Line Items]
Additional Collateral, Aggregate Fair Value	$ 23
Trade receivables [Member] | Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Credit Derivative, Term	30 days

Fair Value Measurement - FV Hie

Fair Value Measurement - FV Hierarchy (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commodity derivative asset, gross	$ 255,000,000	$ 322,000,000
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in Cenovus Energy		2,111,000,000
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in Cenovus Energy	1,256,000,000	2,111,000,000
Available for sale debt securities at fair value	518,000,000	241,000,000
Commodity derivative asset, gross	255,000,000	322,000,000
Total assets	2,029,000,000	2,674,000,000
Commodity derivative liability, gross	220,000,000	311,000,000
Total liabilities	220,000,000	311,000,000
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in Cenovus Energy	1,256,000,000	2,111,000,000
Available for sale debt securities at fair value	17,000,000	25,000,000
Commodity derivative asset, gross	142,000,000	172,000,000
Total assets	1,415,000,000	2,308,000,000
Commodity derivative liability, gross	120,000,000	174,000,000
Total liabilities	120,000,000	174,000,000
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in Cenovus Energy	0	0
Available for sale debt securities at fair value	501,000,000	216,000,000
Commodity derivative asset, gross	101,000,000	114,000,000
Total assets	602,000,000	330,000,000
Commodity derivative liability, gross	91,000,000	115,000,000
Total liabilities	91,000,000	115,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in Cenovus Energy	0	0
Available for sale debt securities at fair value	0	0
Commodity derivative asset, gross	12,000,000	36,000,000
Total assets	12,000,000	36,000,000
Commodity derivative liability, gross	9,000,000	22,000,000
Total liabilities	$ 9,000,000	$ 22,000,000

Fair Value Measurement - FV of

Fair Value Measurement - FV of Commodity Derivatives (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Offsetting Derivative Assets [Abstract]
Assets - gross amounts recognized	$ 255	$ 322
Assets - amounts without right of setoff	2	3
Assets - gross amounts	253	319
Assets - gross amounts offset	157	193
Assets - net amounts presented	96	126
Assets - cash collateral	10	4
Assets - net amounts	86	122
Offsetting Derivative Liabilities [Abstract]
Liabilities - gross amounts recognized	220	311
Liabilities - amounts without right of setoff	1	4
Liabilities - gross amounts recognized	219	307
Liabilities - gross amounts offset	157	193
Liabilities - net amounts presented	62	114
Liabilities - cash collateral	4	12
Commodity derivatives, liability	$ 58	$ 102

Fair Value Measurement - Nonrec

Fair Value Measurement - Nonrecurring (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Millions	1 Months Ended		3 Months Ended		12 Months Ended
	Nov. 30, 2019	May 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Disclosure Item Amounts [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value- Net PP&E (held for sale)	$ 194		$ 65		$ 268	$ 166
Before-Tax Loss - Net PP&E (held for sale)	351		522		287	28
Fair Value - Cost and Equity Method Investments		$ 30		$ 171
Before-Tax Loss - Cost and Equity method investments		95		60
Fair Value, Inputs, Level 1 [Member] | Fair Value, Disclosure Item Amounts [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value- Net PP&E (held for sale)	194		0		0	166
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value - Cost and Equity Method Investments		0		171
Fair Value, Inputs, Level 2 [Member] | Fair Value, Disclosure Item Amounts [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value- Net PP&E (held for sale)	0		0		0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value - Cost and Equity Method Investments		30		0
Fair Value Inputs Level 3 [Member] | Fair Value, Disclosure Item Amounts [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value- Net PP&E (held for sale)	$ 0		$ 65		$ 268	$ 0
Fair Value Inputs Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value - Cost and Equity Method Investments		$ 0		$ 0

Fair Value Measurement - Inputs

Fair Value Measurement - Inputs and Valuation Techniques (Details) - Fair Value Inputs Level 3 [Member] - Lower 48 [Member] - Fair Value, Measurements, Nonrecurring [Member] $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020USD ($)$ / MMBTUMMcf	Dec. 31, 2020USD ($)$ / MMBTUMMcf
Wind River Basin [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure | $	$ 65
Central Basin Platform [Member] | Valuation Technique Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure | $		$ 244
Measurement Input, Commodity Future Price [Member] | Wind River Basin [Member] | Valuation Technique Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
The future price annual increase (decrease) after year 2034, determined the Henry Hub natural gas price outlook based on external pricing service companies' outlooks for years 2022-2034.		2.20%
Measurement Input, Commodity Future Price [Member] | Central Basin Platform [Member] | Valuation Technique Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
The future price annual increase (decrease) after year 2034, determined the Henry Hub natural gas price outlook based on external pricing service companies' outlooks for years 2022-2034.		2.00%
Minimum [Member] | Wind River Basin [Member] | Valuation Technique Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Natural gas production | MMcf	8.4
Minimum [Member] | Central Basin Platform [Member] | Valuation Technique Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Natural gas production | MMcf		0.5
Minimum [Member] | Measurement Input Discount Rate [Member] | Wind River Basin [Member] | Valuation Technique Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount Rate	7.90%
Minimum [Member] | Measurement Input Discount Rate [Member] | Central Basin Platform [Member] | Valuation Technique Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount Rate		6.80%
Minimum [Member] | Measurement Input, Commodity Future Price [Member] | Wind River Basin [Member] | Valuation Technique Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Natural gas price outlook | $ / MMBTU	2.67
Minimum [Member] | Measurement Input, Commodity Future Price [Member] | Central Basin Platform [Member] | Valuation Technique Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Natural gas price outlook | $ / MMBTU		37.35
Maximum [Member] | Wind River Basin [Member] | Valuation Technique Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Natural gas production | MMcf	55.2
Maximum [Member] | Central Basin Platform [Member] | Valuation Technique Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Natural gas production | MMcf		12.7
Maximum [Member] | Measurement Input Discount Rate [Member] | Wind River Basin [Member] | Valuation Technique Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount Rate	9.10%
Maximum [Member] | Measurement Input Discount Rate [Member] | Central Basin Platform [Member] | Valuation Technique Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount Rate		7.70%
Maximum [Member] | Measurement Input, Commodity Future Price [Member] | Wind River Basin [Member] | Valuation Technique Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Natural gas price outlook | $ / MMBTU	9.17
Maximum [Member] | Measurement Input, Commodity Future Price [Member] | Central Basin Platform [Member] | Valuation Technique Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Natural gas price outlook | $ / MMBTU		115.29
Arithmetic Average [Member] | Wind River Basin [Member] | Valuation Technique Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Natural gas production | MMcf	22.9
Arithmetic Average [Member] | Central Basin Platform [Member] | Valuation Technique Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Natural gas production | MMcf		3.4
Arithmetic Average [Member] | Measurement Input Discount Rate [Member] | Wind River Basin [Member] | Valuation Technique Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount Rate	8.30%
Arithmetic Average [Member] | Measurement Input Discount Rate [Member] | Central Basin Platform [Member] | Valuation Technique Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount Rate		7.40%
Arithmetic Average [Member] | Measurement Input, Commodity Future Price [Member] | Wind River Basin [Member] | Valuation Technique Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Natural gas price outlook | $ / MMBTU	5.68
Arithmetic Average [Member] | Measurement Input, Commodity Future Price [Member] | Central Basin Platform [Member] | Valuation Technique Discounted Cash Flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Natural gas price outlook | $ / MMBTU		73.80

Fair Value Measurement - Fair V

Fair Value Measurement - Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 18, 2018
Financial Assets
Investment in Cenovus Energy	$ 1,256	$ 2,111
Derivative Asset, Fair Value, Amount Offset Against Collateral	96	126
Carrying Amount [Member]
Financial Assets
Investment in Cenovus Energy	1,256	2,111
Available for sale debt securities at fair value	518		$ 241
Total loans and advances - related parties	220	339
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term Debt	14,478	14,175
Carrying Amount [Member] | Commodity Contract [Member]
Financial Assets
Derivative Asset, Fair Value, Amount Offset Against Collateral	88	125
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Commodity derivatives	59	106
Fair Value [Member]
Financial Assets
Investment in Cenovus Energy	1,256	2,111
Available for sale debt securities at fair value	518	241
Total loans and advances - related parties	220	339
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term Debt	19,106	18,108
Fair Value [Member] | Commodity Contract [Member]
Financial Assets
Derivative Asset, Fair Value, Amount Offset Against Collateral	88	125
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Commodity derivatives	$ 59	$ 106

Fair Value Measurement - Textua

Fair Value Measurement - Textuals (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Derivative and Financial Instruments [Abstract]
Obligations to return cash collateral	$ 10	$ 4
Rights to reclaim cash collateral	$ 4	$ 12

Equity - changes in shares of c

Equity - changes in shares of common stock (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Changes in shares of common stock
Beginning Balance, Common Stock	1,795,652,203	1,791,637,434	1,785,419,175
Treasury Stock, Shares, Beginning Balance	710,783,814	653,288,213	608,312,034
Repurchase of common stock	20,018,275	57,495,601	44,976,179
Distributed under benefit plans	3,192,064	4,014,769	6,218,259
Ending Balance, Common Stock	1,798,844,267	1,795,652,203	1,791,637,434
Treasury Stock, Shares, Ending Balance	730,802,089	710,783,814	653,288,213

Equity - Textuals (Details)

Equity - Textuals (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended			37 Months Ended
	Oct. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2016
Equity [Abstract]
Preferred Stock, Authorized		500,000,000
Preferred Stock, Par or Stated Value Per Share		$ 0.01
Preferred Stock, Shares Issued		0
Preferred Stock, Shares Outstanding		0
Stockholders' Equity Attributable to Noncontrolling Interest		$ 0	$ 69		$ 69
Treasury Stock, Shares, Acquired					189
Treasury Stock Value Acquired Cost Method	$ 200	$ 892	$ 3,500	$ 2,999	$ 10,517
Stock Repurchase Program Authorized						$ 25,000

Non Mineral Leases - Intro (Det

Non Mineral Leases - Intro (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finance Lease Obligations	$ 891	$ 720
Operating Lease, Liability	$ 785
Co Venturer Member
Lease, Practical Expedients, Package [true false]	true
Lease Practical Expedient Lessor Single Lease Component	true

Non-Mineral Leases - Balance Sh

Non-Mineral Leases - Balance Sheet (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Gross	$ 102,106,000,000	$ 97,746,000,000
Accumulated DD&A	(62,213,000,000)	(55,477,000,000)
Properties, plants and equipment, net	39,893,000,000	42,269,000,000
Short-term debt	619,000,000	105,000,000
Long-term debt	14,750,000,000	14,790,000,000
Finance Lease, Liability Total	891,000,000
Prepaid expenses and other current assets	454,000,000	2,259,000,000
Other assets (leases)	2,528,000,000	2,426,000,000
Other Liabilities, Current	1,121,000,000	2,045,000,000
Operating Lease, Liability	$ 785,000,000
Operating Lease Liability Statement Of Financial Position Extensible List	us-gaap:OtherLiabilities
Previously Reported [Member]
Gross	$ 1,375,000,000	1,039,000,000
Accumulated DD&A	(721,000,000)	(649,000,000)
Properties, plants and equipment, net	654,000,000	390,000,000
Short-term debt	168,000,000	87,000,000
Long-term debt	723,000,000	633,000,000
Finance Lease, Liability Total	891,000,000	720,000,000
Prepaid expenses and other current assets	0	40,000,000
Other assets (leases)	783,000,000	896,000,000
Other Liabilities, Current	226,000,000	347,000,000
Deferred Credits and Other Liabilities, non current	559,000,000	585,000,000
Operating Lease, Liability	$ 785,000,000	$ 932,000,000

Non-Mineral Leases - Balance _2

Non-Mineral Leases - Balance Sheet Liabilities (Details) $ in Millions	Dec. 31, 2020USD ($)
Finance Lease, Liability Total	$ 891
Operating Lease, Liability	$ 785

Non-Mineral Leases - Other Info

Non-Mineral Leases - Other Info (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 321	$ 341
Amortization of right-of-use assets	163	99
Interest on lease liabilities	34	37
Short-term Lease Cost	42	77
Lease Cost Total	$ 560	$ 554
Weighted-average term (years) - Operating Leases	6 years 1 month 9 days	5 years 2 months 8 days
Weighted-average term (years) - Finance Leases	7 years 1 month 13 days	8 years 8 months 12 days
Weighted Average Discount Rate (Percent) - Operating Leases	2.78%	3.10%
Weighted Average Discount Rate (Percent) - Finance Leases	4.27%	5.53%
Cash Flow, Operating Activities, Lessee [Abstract]
Operating cash flows from operating leases	$ 232	$ 203
Operating cash flows from finance leases	11	27
Financing cash flows from finance leases	255	81
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	250	499
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 426	$ 26

Non-Mineral Leases - Maturities

Non-Mineral Leases - Maturities (Details) $ in Millions	Dec. 31, 2020USD ($)
Operating Lease Liabilities, Payments Due [Abstract]
2021	$ 245
2022	155
2023	116
2024	94
2025	55
Remaining Years	200
Lessee, Operating Lease, Liability, Payments, Due, Total	865	[1]
Finance Lease Liabilities, Payments, Due [Abstract]
2021	213
2022	162
2023	148
2024	113
2025	87
Remaining Years	320
Finance Lease Liability, Payments, Due, Total	$ 1,043	[1]
[1]	*Future lease payments for operating and finance leases commencing on or components in accordance with our election to adopt the optional practical components for accounting purposes. company have been included in the table on a proportionate basis consistent company or oil and gas venture.

Non-Mineral Leases - Maturiti_2

Non-Mineral Leases - Maturities under 840 (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Capital lease obligations Under 840 [Abstract]
Finance Lease Obligations, Total	$ 891	$ 720

Non-Mineral Leases - Total Leas

Non-Mineral Leases - Total Lease Liabilities (Details) $ in Millions	Dec. 31, 2020USD ($)
Operating Lease Liabilities Gross Difference Amount [Abstract]
Operating Lease, Liability	$ 785
Interest on operating lease liabilities	(80)
Lessee, Operating Lease, Liability, Payments, Due, Total	$ 865	[1]
Operating Lease Liability Statement Of Financial Position Extensible List	us-gaap:OtherLiabilities
Finance Lease Liabilities, Gross Difference, Amount [Abstract]
Finance Lease, Liability Total	$ 891
Interest on Finance lease liabilities	(152)
Finance Lease Liability, Payments, Due, Total	$ 1,043	[1]
[1]	*Future lease payments for operating and finance leases commencing on or components in accordance with our election to adopt the optional practical components for accounting purposes. company have been included in the table on a proportionate basis consistent company or oil and gas venture.

Non-Mineral Leases - Operating

Non-Mineral Leases - Operating Lease Rentals (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)
Operating lease rental expense
Operating Leases, Rent Expense, Minimum Rentals	$ 253
Less sublease rentals	(16)
Operating Leases, Rent Expense, Total	$ 237

Non-Mineral Leases - End Notes

Non-Mineral Leases - End Notes (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment, Net	$ 39,893,000,000	$ 42,269,000,000
Property plant equipment | Co Venturer Member
Property, Plant and Equipment, Net	258,000,000	335,000,000
Short term debt | Co Venturer Member
Finance Lease, Liability, Current	97,000,000	56,000,000
Long-term Debt Member | Co Venturer Member
Finance Lease, Liability, Noncurrent	$ 522,000,000	$ 579,000,000

Employee Benefit Plans - Change

Employee Benefit Plans - Change in Benefit Obligations and Fair Value of Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Plans Defined Benefit [Member] | US
Change in Benefit Obligation
Benefit obligation at January 1	$ 2,319	$ 2,136
Service cost	85	79	$ 83
Interest cost	66	79	99
Plan participant contributions	0	0
Plan amendments	0	0
Actuarial (gain) loss	319	278
Benefits paid	(241)	(253)
Curtailment	0	0
Recognition of termination benefits	0	0
Foreign currency exchange rate change	0	0
Benefit obligation at December 31	2,548	2,319	2,136
Change in Fair Value of Plan Assets
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	1,591	1,336
Actual return on plan assets	321	273
Company contributions	99	235
Plan participant contributions	0	0
Defined Benefit Plan Plan Assets Benefits Paid	(241)	(253)
Foreign currency exchange rate change	0	0
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	1,770	1,591	1,336
Funded Status	(778)	(728)
Pension Plans Defined Benefit [Member] | Foreign Pension Plans, Defined Benefit [Member]
Change in Benefit Obligation
Benefit obligation at January 1	3,880	3,438
Service cost	54	69	81
Interest cost	85	97	107
Plan participant contributions	1	2
Plan amendments	2	0
Actuarial (gain) loss	398	387
Benefits paid	(151)	(147)
Curtailment	2	(69)
Recognition of termination benefits	3	1
Foreign currency exchange rate change	129	102
Benefit obligation at December 31	4,403	3,880	3,438
Change in Fair Value of Plan Assets
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	4,306	3,358
Actual return on plan assets	416	529
Company contributions	60	464
Plan participant contributions	1	2
Defined Benefit Plan Plan Assets Benefits Paid	(151)	(147)
Foreign currency exchange rate change	161	100
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	4,793	4,306	3,358
Funded Status	390	426
Other Postretirement Benefit Plans, Defined Benefit [Member]
Change in Benefit Obligation
Benefit obligation at January 1	216	218
Service cost	2	1	1
Interest cost	6	8	8
Plan participant contributions	18	20
Plan amendments	(30)	0
Actuarial (gain) loss	7	27
Benefits paid	(49)	(59)
Curtailment	0	0
Recognition of termination benefits	0	0
Foreign currency exchange rate change	0	1
Benefit obligation at December 31	170	216	218
Change in Fair Value of Plan Assets
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance	0	0
Actual return on plan assets	0	0
Company contributions	31	39
Plan participant contributions	18	20
Defined Benefit Plan Plan Assets Benefits Paid	(49)	(59)
Foreign currency exchange rate change	0	0
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance	0	0	$ 0
Funded Status	$ (170)	$ (216)

Employee Benefit Plans - Chan_2

Employee Benefit Plans - Change in Benefit Obligations (Parenthetical) (Details) - Pension Plans Defined Benefit [Member] - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
US
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 2,359	$ 2,161
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 4,095	$ 3,594

Employee Benefit Plans - Projec

Employee Benefit Plans - Projected and Accumulated Benefit Obligations in Excess of Fair Value (Details) - Pension Plans Defined Benefit [Member] - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
US
Compensation And Retirement Disclosure [Abstract]
Accumulated benefit obligation	$ 2,359	$ 2,161
Fair values of pension plan assets	1,770	1,591	$ 1,336
Defined Benefit Plan Plans With Benefit Obligations In Excess Of Plan Assets [Abstract]
Projected benefit obligation	2,548	2,319
Fair value of plan assets	1,770	1,591
Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets [Abstract]
Accumulated benefit obligation	2,359	2,161
Fair value of plan assets	1,770	1,591
Foreign Plan [Member]
Compensation And Retirement Disclosure [Abstract]
Accumulated benefit obligation	4,095	3,594
Fair values of pension plan assets	4,793	4,306	$ 3,358
Defined Benefit Plan Plans With Benefit Obligations In Excess Of Plan Assets [Abstract]
Projected benefit obligation	391	355
Fair value of plan assets	35	44
Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets [Abstract]
Accumulated benefit obligation	338	299
Fair value of plan assets	$ 35	$ 44

Employee Benefit Plans - Amount

Employee Benefit Plans - Amounts recognized in Balance Sheet And Assumptions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Amounts Recognized in the Consolidated Balance Sheet
Noncurrent liabilities	$ (1,697)	$ (1,781)
Pension Plans Defined Benefit [Member] | US
Amounts Recognized in the Consolidated Balance Sheet
Noncurrent assets	0	0
Current liabilities	(56)	(21)
Noncurrent liabilities	(722)	(707)
Total recognized	$ (778)	$ (728)
Weighted-Average Assumptions Used to Determine Benefit Obligations at December 31
Discount rate	2.30%	3.25%
Rate of compensation increase	4.00%	4.00%
Interest crediting rate for applicable benefits	2.10%	4.10%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for Years Ended December 31
Discount rate	3.05%	3.95%
Expected return on plan assets	5.80%	5.80%
Rate of compensation increase	4.00%	4.00%
Interest crediting rate for applicable benefits	4.10%	4.35%
Before-tax amounts unrecognized in net periodic postretirement benefit cost
Unrecognized net actuarial loss (gain)	$ 467	$ 479
Unrecognized prior service cost (credit)	0	0
Pension Plans Defined Benefit [Member] | Foreign Pension Plans, Defined Benefit [Member]
Amounts Recognized in the Consolidated Balance Sheet
Noncurrent assets	746	765
Current liabilities	(11)	(6)
Noncurrent liabilities	(345)	(333)
Total recognized	$ 390	$ 426
Weighted-Average Assumptions Used to Determine Benefit Obligations at December 31
Discount rate	1.80%	2.35%
Rate of compensation increase	3.10%	3.35%
Interest crediting rate for applicable benefits	0.00%	0.00%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for Years Ended December 31
Discount rate	2.35%	2.90%
Expected return on plan assets	3.60%	4.10%
Rate of compensation increase	3.35%	3.65%
Interest crediting rate for applicable benefits	0.00%	0.00%
Before-tax amounts unrecognized in net periodic postretirement benefit cost
Unrecognized net actuarial loss (gain)	$ 326	$ 227
Unrecognized prior service cost (credit)	0	(2)
Other Postretirement Benefit Plans, Defined Benefit [Member]
Amounts Recognized in the Consolidated Balance Sheet
Noncurrent assets	0	0
Current liabilities	(39)	(42)
Noncurrent liabilities	(131)	(174)
Total recognized	$ (170)	$ (216)
Weighted-Average Assumptions Used to Determine Benefit Obligations at December 31
Discount rate	2.15%	3.10%
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for Years Ended December 31
Discount rate	3.10%	4.05%
Before-tax amounts unrecognized in net periodic postretirement benefit cost
Unrecognized net actuarial loss (gain)	$ 14	$ 8
Unrecognized prior service cost (credit)	$ (182)	$ (183)

Employee Benefit Plans - Source

Employee Benefit Plans - Sources of Change in Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Sources of change in other comprehensive income (loss)
Net actuarial loss arising during the period	$ (210)	$ (55)	$ (150)
Amortization of (gain) loss included in income	117	146	279
Net actuarial gain, Before-tax	(93)	91	129
Prior service (cost) credit arising during the period	29	0	(7)
Amortization of prior service cost (credit) included in net loss	(32)	(35)	(40)
Net change during the period	(3)	(35)	$ (47)
Other Postretirement Benefit Plans, Defined Benefit [Member]
Sources of change in other comprehensive income (loss)
Net actuarial loss arising during the period	(7)	(27)
Amortization of (gain) loss included in income	1	(2)
Net actuarial gain, Before-tax	(6)	(29)
Prior service (cost) credit arising during the period	30	0
Amortization of prior service cost (credit) included in net loss	(31)	(33)
Net change during the period	(1)	(33)
Pension Plans Defined Benefit [Member] | US
Sources of change in other comprehensive income (loss)
Net actuarial loss arising during the period	(83)	(79)
Amortization of (gain) loss included in income	95	116
Net actuarial gain, Before-tax	12	37
Prior service (cost) credit arising during the period	0	0
Amortization of prior service cost (credit) included in net loss	0	0
Net change during the period	0	0
Pension Plans Defined Benefit [Member] | Foreign Plan [Member]
Sources of change in other comprehensive income (loss)
Net actuarial loss arising during the period	(120)	51
Amortization of (gain) loss included in income	21	32
Net actuarial gain, Before-tax	(99)	83
Prior service (cost) credit arising during the period	(1)	0
Amortization of prior service cost (credit) included in net loss	(1)	(2)
Net change during the period	$ (2)	$ (2)

Employee Benefit Plans - Compon

Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Plans Defined Benefit [Member] | US
Net periodic benefit cost of all defined benefit plans
Service cost	$ 85	$ 79	$ 83
Interest cost	66	79	99
Expected return on plan assets	(85)	(74)	(114)
Amortization of prior service cost (credit)	0	0	0
Recognized net actuarial loss (gain)	51	54	53
Pension settlement losses	44	62	196
Net periodic benefit cost	161	200	317
Pension Plans Defined Benefit [Member] | Foreign Plan [Member]
Net periodic benefit cost of all defined benefit plans
Service cost	54	69	81
Interest cost	85	97	107
Expected return on plan assets	(145)	(138)	(155)
Amortization of prior service cost (credit)	(1)	(2)	(5)
Recognized net actuarial loss (gain)	22	32	31
Pension settlement losses	(1)	0	0
Net periodic benefit cost	14	58	59
Other Postretirement Benefit Plans, Defined Benefit [Member]
Net periodic benefit cost of all defined benefit plans
Service cost	2	1	1
Interest cost	6	8	8
Expected return on plan assets	0	0	0
Amortization of prior service cost (credit)	(31)	(33)	(35)
Recognized net actuarial loss (gain)	1	(2)	(1)
Pension settlement losses	0	0	0
Net periodic benefit cost	$ (22)	$ (26)	$ (27)

Employee Benefit Plans - Benefi

Employee Benefit Plans - Benefit Cost Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Percent Amortized Of Unamortized Balance For Net Actuarial Gain And Losses		10.00%
Other Comprehensive Income (Loss), Defined Benefit Plans		$ 75	$ (51)	$ (39)
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension settlement losses		$ 0	$ 0	0
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		2.15%	3.10%
US | Pension Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension settlement losses		$ (44)	$ (62)	(196)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		2.30%	3.25%
US | Other Postretirement Benefit Plans, Defined Benefit [Member] | Pre Sixty Five Retiree[Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year		7.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate		5.00%
US | Other Postretirement Benefit Plans, Defined Benefit [Member] | Post Sixty Five Retiree [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year		4.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate		5.00%
US | Qualified Plan [Member] | Pension Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension settlement losses		$ (43)	$ (62)	(196)
Foreign Plan [Member] | Pension Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension settlement losses		$ 1	$ 0	$ 0
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		1.80%	2.35%
Foreign Plan [Member] | Qualified Plan [Member] | Pension Plans Defined Benefit [Member] | Certain United Kingdom Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Change In Defined Benefit Assets	$ 43
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	1.80%			2.90%

Employee Benefit Plans - Plan A

Employee Benefit Plans - Plan Asset Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Pension Plans Defined Benefit [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 2,359	$ 2,161
Defined Benefit Plan, Actual Return on Plan Assets	321	273
Insurance Contract Rights And Obligations Fair Value Option [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Of Participating Interest In Annuity Contract	94	95
Insurance Contract Rights And Obligations Fair Value Option [Member] | Fair Value Inputs Level 3 [Member] | Pension Plans Defined Benefit [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Fair Value Of Participating Interest In Annuity Contract	94	95
Accumulated benefit obligation	$ 139	140
Defined Benefit Plan, Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations for plan assets	28.00%
Defined Benefit Plan, Debt Security [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations for plan assets	68.00%
Defined Benefit Plan, Debt Security [Member] | Insurance Contract Rights And Obligations Fair Value Option [Member] | Fair Value Inputs Level 3 [Member] | Pension Plans Defined Benefit [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Fair Value Of Participating Interest In Annuity Contract	$ 233	$ 235
Defined Benefit Plan, Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations for plan assets	3.00%
Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocations for plan assets	1.00%

Employee Benefit Plans - Fair v

Employee Benefit Plans - Fair values of pension plan assets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Disclosure Item Amounts [Domain] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	$ 1,675	$ 1,496
Fair Value, Disclosure Item Amounts [Domain] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	4,787	4,297
US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	180	294
Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	1,646	3,258
US Equity Securities [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	8	101
US Equity Securities [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	435
International Equity Securities [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	99	98
International Equity Securities [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	266
Mutual Funds -Equity [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	72	93
Mutual Funds -Equity [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	969	512
Common Collective Trust Equity Securities [Member] | Portion at Net Asset Value [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	678	457
Common Collective Trust Equity Securities [Member] | Portion at Net Asset Value [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	2,962	167
US Government Debt Securities [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
US Government Debt Securities [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	1,412
Debt Security, Corporate, US [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	1	2
Debt Security, Corporate, US [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Debt Security Mutual Fund [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Debt Security Mutual Fund [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	455	392
Defined Benefit Plan, Common Collective Trust [Member] | Portion at Net Asset Value [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	730	637
Defined Benefit Plan, Common Collective Trust [Member] | Portion at Net Asset Value [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	67	760
Defined Benefit Plan, Cash and Cash Equivalents [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Defined Benefit Plan, Cash and Cash Equivalents [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	74	98
Defined Benefit Plan, Cash and Cash Equivalents [Member] | Portion at Net Asset Value [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	8	25
Defined Benefit Plan, Cash and Cash Equivalents [Member] | Portion at Net Asset Value [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Bank Time Deposits [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets		0
Bank Time Deposits [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets		0
Defined Benefit Plan, Derivative [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Defined Benefit Plan, Derivative [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	6	11
Defined Benefit Plan, Real Estate [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Defined Benefit Plan, Real Estate [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	142	132
Defined Benefit Plan, Real Estate [Member] | Portion at Net Asset Value [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	79	83
Defined Benefit Plan, Real Estate [Member] | Portion at Net Asset Value [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	112	112
Fair Value, Inputs, Level 1 [Member] | Fair Value, Disclosure Item Amounts [Domain] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	171	285
Fair Value, Inputs, Level 1 [Member] | Fair Value, Disclosure Item Amounts [Domain] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	770	2,859
Fair Value, Inputs, Level 1 [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	171	285
Fair Value, Inputs, Level 1 [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	770	2,859
Fair Value, Inputs, Level 1 [Member] | US Equity Securities [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	94
Fair Value, Inputs, Level 1 [Member] | US Equity Securities [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	435
Fair Value, Inputs, Level 1 [Member] | International Equity Securities [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	99	98
Fair Value, Inputs, Level 1 [Member] | International Equity Securities [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	266
Fair Value, Inputs, Level 1 [Member] | Mutual Funds -Equity [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	72	93
Fair Value, Inputs, Level 1 [Member] | Mutual Funds -Equity [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	235	245
Fair Value, Inputs, Level 1 [Member] | US Government Debt Securities [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value, Inputs, Level 1 [Member] | US Government Debt Securities [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	1,412
Fair Value, Inputs, Level 1 [Member] | Debt Security, Corporate, US [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value, Inputs, Level 1 [Member] | Debt Security, Corporate, US [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value, Inputs, Level 1 [Member] | Debt Security Mutual Fund [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value, Inputs, Level 1 [Member] | Debt Security Mutual Fund [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	455	392
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	74	98
Fair Value, Inputs, Level 1 [Member] | Bank Time Deposits [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets		0
Fair Value, Inputs, Level 1 [Member] | Bank Time Deposits [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets		0
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Derivative [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Derivative [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	6	11
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Real Estate [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value, Inputs, Level 1 [Member] | Defined Benefit Plan, Real Estate [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Disclosure Item Amounts [Domain] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	4	2
Fair Value, Inputs, Level 2 [Member] | Fair Value, Disclosure Item Amounts [Domain] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	734	267
Fair Value, Inputs, Level 2 [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	4	2
Fair Value, Inputs, Level 2 [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	734	267
Fair Value, Inputs, Level 2 [Member] | US Equity Securities [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	3	0
Fair Value, Inputs, Level 2 [Member] | US Equity Securities [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value, Inputs, Level 2 [Member] | International Equity Securities [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value, Inputs, Level 2 [Member] | International Equity Securities [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value, Inputs, Level 2 [Member] | Mutual Funds -Equity [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value, Inputs, Level 2 [Member] | Mutual Funds -Equity [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	734	267
Fair Value, Inputs, Level 2 [Member] | US Government Debt Securities [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value, Inputs, Level 2 [Member] | US Government Debt Securities [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value, Inputs, Level 2 [Member] | Debt Security, Corporate, US [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	1	2
Fair Value, Inputs, Level 2 [Member] | Debt Security, Corporate, US [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value, Inputs, Level 2 [Member] | Debt Security Mutual Fund [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value, Inputs, Level 2 [Member] | Debt Security Mutual Fund [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value, Inputs, Level 2 [Member] | Bank Time Deposits [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets		0
Fair Value, Inputs, Level 2 [Member] | Bank Time Deposits [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets		0
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Derivative [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Derivative [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Real Estate [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value, Inputs, Level 2 [Member] | Defined Benefit Plan, Real Estate [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value Inputs Level 3 [Member] | Fair Value, Disclosure Item Amounts [Domain] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	5	7
Fair Value Inputs Level 3 [Member] | Fair Value, Disclosure Item Amounts [Domain] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	142	132
Fair Value Inputs Level 3 [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	5	7
Fair Value Inputs Level 3 [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	142	132
Fair Value Inputs Level 3 [Member] | US Equity Securities [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	5	7
Fair Value Inputs Level 3 [Member] | US Equity Securities [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value Inputs Level 3 [Member] | International Equity Securities [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value Inputs Level 3 [Member] | International Equity Securities [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value Inputs Level 3 [Member] | Mutual Funds -Equity [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value Inputs Level 3 [Member] | Mutual Funds -Equity [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value Inputs Level 3 [Member] | US Government Debt Securities [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value Inputs Level 3 [Member] | US Government Debt Securities [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value Inputs Level 3 [Member] | Debt Security, Corporate, US [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value Inputs Level 3 [Member] | Debt Security, Corporate, US [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value Inputs Level 3 [Member] | Debt Security Mutual Fund [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value Inputs Level 3 [Member] | Debt Security Mutual Fund [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value Inputs Level 3 [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value Inputs Level 3 [Member] | Defined Benefit Plan, Cash and Cash Equivalents [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value Inputs Level 3 [Member] | Bank Time Deposits [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets		0
Fair Value Inputs Level 3 [Member] | Bank Time Deposits [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets		0
Fair Value Inputs Level 3 [Member] | Defined Benefit Plan, Derivative [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value Inputs Level 3 [Member] | Defined Benefit Plan, Derivative [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value Inputs Level 3 [Member] | Defined Benefit Plan, Real Estate [Member] | US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	0	0
Fair Value Inputs Level 3 [Member] | Defined Benefit Plan, Real Estate [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Selected Plan Assets	$ 142	$ 132

Employee Benefit Plans - Fair_2

Employee Benefit Plans - Fair values of pension plan assets (Parenthetical) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Net payables related to security transactions	$ 7	$ 9
Insurance Contract Rights And Obligations Fair Value Option [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value Of Participating Interest In Annuity Contract	$ 94	$ 95

Employee Benefit Plans - Fundin

Employee Benefit Plans - Funding Policy (Details) $ in Millions	Dec. 31, 2020USD ($)
Foreign Plan [Member] | Retirement Plan Tax Status [Domain]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	$ 75

Employee Benefit Plans - Bene_2

Employee Benefit Plans - Benefit payments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Benefit payments excluding the participating annuity contract and which reflect expected future service, as appropriate, are expected to be paid:
Compensation cost	$ 159	$ 274	$ 265
Tax benefit	40	$ 71	$ 64
Pension Plans Defined Benefit [Member] | US
Benefit payments excluding the participating annuity contract and which reflect expected future service, as appropriate, are expected to be paid:
2021	532
2022	289
2023	248
2024	232
2025	215
2026-2030	845
Pension Plans Defined Benefit [Member] | Foreign Pension Plans, Defined Benefit [Member]
Benefit payments excluding the participating annuity contract and which reflect expected future service, as appropriate, are expected to be paid:
2021	147
2022	151
2023	156
2024	162
2025	166
2026-2030	897
Other Postretirement Benefit Plans, Defined Benefit [Member]
Benefit payments excluding the participating annuity contract and which reflect expected future service, as appropriate, are expected to be paid:
2021	25
2022	21
2023	18
2024	16
2025	14
2026-2030	$ 53

Employee Benefit Plans - Severa

Employee Benefit Plans - Severances (Details) - Employee Severance [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Supplemental Unemployment Benefits [Line Items]
Balance at December 31, 2018	$ 23	$ 48	$ 53
Accruals	14	(1)	70
Benefit payments	(13)	(24)	(73)
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Benefit Obligation	0	0	(2)
Balance at December 31, 2019	24	$ 23	$ 48
Short term supplemental unemployment benefits [Member]
Supplemental Unemployment Benefits [Line Items]
Balance at December 31, 2019	$ 8

Employee Benefit Plans - Other

Employee Benefit Plans - Other Plan Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)shares	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Share-based Compensation Plan
Defined Benefit Plan Disclosure [Line Items]
Share Based Compensation Plan, number of shares authorized	79,000,000
Other Postretirement Benefit Plans, Defined Benefit [Member] | Share-based Compensation Plan
Defined Benefit Plan Disclosure [Line Items]
Deferred Compensation Arrangement with Individual, Maximum Contractual Term	10 years
US
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan Maximum Annual Contributions Per Employee Percent	75.00%
Number Of Investment Funds In Which Employee Can Contribute [Member]	(17)
Defined Contribution Plan, Employer Matching Contribution, Percent	1.00%
Defined Contribution Plan Employer Matching Contribution Percent Of Match	6.00%
Employer Matching Discretionary Contribution Percent	6.00%
Company contributions charged to expense for defined contribution plan | $	$ 62	$ 82	$ 82
US | cop_IncentiveStockOptionsMember [Member]
Defined Benefit Plan Disclosure [Line Items]
Share Based Compensation Plan, number of shares authorized	40,000,000
US | Company Retirement Contribution (CRC)
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan Employer Matching Contribution Percent Of Match	6.00%
Defined Contribution Plan Employers Vesting Period	3 years
Defined contribution plan employers vesting percent	100.00%
US | Share-based Compensation Plan
Defined Benefit Plan Disclosure [Line Items]
Share Based Compensation Plan, number of shares authorized	79,000,000
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Company contributions charged to expense for defined contribution plan | $	$ 25	$ 30	$ 31

Employee Benefit Plans - Stock

Employee Benefit Plans - Stock option activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary of Stock Options Activity
Weighted-Average Exercise Price at the beginning of year	$ 54.11
Weighted-Average Exercise Price, exercised	38.80
Weighted-Average Exercise Price, forfeited	49.76
Weighted-Average Exercise Price at the end of year	55.12	$ 54.11
Weighted-Average Exercise Price, Vested	55.12
Weighted-Average Exercise Price, Exercisable	$ 55.12
Aggregate Intrinsic Value, outstanding at the beginning of the year	$ 206
Aggregate Intrinsic Value, exercised	23
Aggregate Intrinsic Value, outstanding at the end of the year	22	$ 206
Aggregate Intrinsic Value, vested	22
Aggregate Intrinsic Value, exercisable	$ 22
Stock option, Outstanding at the beginning of year	18,040,197
Stock option, exercised	(1,111,805)
Stock option, forfeited	(5,867)
Stock option, expired or cancelled	0
Stock options, Outstanding at the end of year	16,922,525	18,040,197
Stock option, Vested	16,922,525
Stock option, Exercisable at End of Year	16,922,525
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate Intrinsic Value, exercised	$ 23
Employee Stock Option [Member] | 2014 Omnibus Stock And Performance Incentive Plan Of ConocoPhillips [Member]
Summary of Stock Options Activity
Aggregate Intrinsic Value, exercised		$ 39	$ 94
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average remaining contractual term of outstanding options	3 years 7 months 28 days
Aggregate Intrinsic Value, exercised		$ 39	$ 94
Cash received from exercise of stock options	$ 43
Tax benefit from exercise of options	$ 9

Employee Benefit Plans - Stoc_2

Employee Benefit Plans - Stock unit activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary of stock unit activity
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	16,922,525
RSU Stock Settled [Member]
Summary of stock unit activity
Stock Units, Outstanding Beginning of year	6,223,046
Stock Units, Granted	2,890,840
Stock Units, Forfeited / Cancelled	(127,181)
Stock Units, Issued	(2,554,720)
Stock Units, Outstanding End of year	6,431,985	6,223,046
Not Vested at End of Year	4,230,413
Weighted-Average Grant-Date Fair Value, beginning of year	$ 55.99
Weighted-Average Grant-Date Fair Value, Granted	57.40	$ 67.77	$ 52.45
Weighted-Average Grant-Date Fair Value, Forfeited / Cancelled	55.84
Weighted-Average Grant-Date Fair Value, Issued	50.16
Weighted-Average Grant-Date Fair Value, ending of year	58.94	$ 55.99
Weighted-Average Grant-Date Fair Value Not Vested, ending of year	$ 59.01
Total Fair Value, Issued	$ 143	$ 225	$ 154
Employee Benefit Plans Additional (Textual) [Abstract]
Unrecognized compensation cost from stock options	$ 101
Weighted average period of recognition of unvested options, in months	1 year 8 months 15 days
Longest weighted-average period of recognition of unvested options, in months	2 years 1 month 20 days
Total Fair Value, Issued	$ 143	$ 225	$ 154
RSU Cash Settled [Member]
Summary of stock unit activity
Stock Units, Outstanding Beginning of year	596,991
Stock Units, Granted	24,437
Stock Units, Forfeited / Cancelled	(5,622)
Stock Units, Issued	(1,191)
Stock Units, Outstanding End of year	614,615	596,991
Not Vested at End of Year	121,696
Weighted-Average Grant-Date Fair Value, beginning of year	$ 64.54
Weighted-Average Grant-Date Fair Value, Granted	41.59	$ 68.20	$ 53.68
Weighted-Average Grant-Date Fair Value, Forfeited / Cancelled	40.01
Weighted-Average Grant-Date Fair Value, Issued	40.20
Weighted-Average Grant-Date Fair Value, ending of year	39.95	$ 64.54
Weighted-Average Grant-Date Fair Value Not Vested, ending of year	$ 39.95
Total Fair Value, Issued	$ 0	$ 6	$ 1
Employee Benefit Plans Additional (Textual) [Abstract]
Unrecognized compensation cost from stock options	$ 1
Weighted average period of recognition of unvested options, in months	1 year
Longest weighted-average period of recognition of unvested options, in months	1 year 1 month 13 days
Total Fair Value, Issued	$ 0	$ 6	$ 1

Employee Benefit Plans - Perfor

Employee Benefit Plans - Performance share activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
PSU Stock Settled [Member]
Summary of Performance Share Program activity
Stock Units, Outstanding Beginning of year	2,024,824
Stock Units, Granted	26,244
Stock Units, Forfeited / Cancelled	0
Stock Units, Issued	(314,340)
Stock Units, Outstanding End of year	1,736,728	2,024,824
Not Vested at End of Year	3,191
Weighted-Average Grant-Date Fair Value, beginning of year	$ 50.55
Weighted-Average Grant-Date Fair Value, Granted	58.61	$ 68.90	$ 53.28
Weighted-Average Grant-Date Fair Value, Issued	51.15
Weighted-Average Grant-Date Fair Value, ending of year	50.56	$ 50.55
Weighted-Average Grant-Date Fair Value Not Vested, ending of year	$ 48.61
Total Fair Value, Issued	$ 13,000,000	$ 25,000,000	$ 29,000,000
Employee Benefit Plans Additional (Textual) [Abstract]
Unrecognized compensation cost from stock options	0
Total Fair Value, Issued	$ 13,000,000	$ 25,000,000	$ 29,000,000
PSU Cash Settled [Member]
Summary of Performance Share Program activity
Stock Units, Outstanding Beginning of year	609,274
Stock Units, Granted	1,491,098
Stock Units, Forfeited / Cancelled	0
Stock Units, Issued	(1,975,843)
Stock Units, Outstanding End of year	124,529	609,274
Weighted-Average Grant-Date Fair Value, beginning of year	$ 64.54
Weighted-Average Grant-Date Fair Value, Granted	58.61	$ 68.90	$ 53.28
Weighted-Average Grant-Date Fair Value, Issued	58.54
Weighted-Average Grant-Date Fair Value, ending of year	$ 39.95	$ 64.54
Total Fair Value, Issued	$ 116,000,000	$ 171,000,000	$ 22,000,000
Employee Benefit Plans Additional (Textual) [Abstract]
Unrecognized compensation cost from stock options	0
Total Fair Value, Issued	$ 116,000,000	$ 171,000,000	$ 22,000,000

Employee Benefit Plans - Restri

Employee Benefit Plans - Restricted shares and units (Details) - Restricted Stock Units (RSUs) [Member] - Discontinued Operations [Member] - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary of aggregate activity of restricted shares and units
Stock Units, Outstanding Beginning of year	991,908
Stock Units, Granted	77,824
Stock Units, Forfeited / Cancelled	(1,336)
Stock Units, Issued	(98,297)
Stock Units, Outstanding End of year	970,099	991,908
Weighted-Average Grant-Date Fair Value, beginning of year	$ 47.24
Weighted-Average Grant-Date Fair Value, Granted	51.46	$ 63.58	$ 62.01
Weighted-Average Grant-Date Fair Value, Forfeited / Cancelled	23.09
Weighted-Average Grant-Date Fair Value, Issued	45.57
Weighted-Average Grant-Date Fair Value, ending of year	$ 47.78	$ 47.24
Total Fair Value, Issued	$ 6,000,000	$ 11,000,000	$ 17,000,000
Employee Benefit Plans Additional (Textual) [Abstract]
Unrecognized compensation cost from stock options	0
Total Fair Value, Issued	$ 6,000,000	$ 11,000,000	$ 17,000,000

Employee Benefits Plans (Textua

Employee Benefits Plans (Textual) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income, Defined Benefit Plan, Net Prior Service Cost (Credit) Arising During Period, before Tax	$ (29)	$ 0	$ 7
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	0	0	0
Defined Benefit Plan Special Termination Benefits	0	0
Defined Benefit Plan, Actual Return on Plan Assets	0	0
Defined Benefit Plan, Plan Amendments	(30)	0
Other Comprehensive Income, Defined Benefit Plan, Net Prior Service Cost (Credit) Arising During Period, before Tax	(30)	0
US
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	265
US | Pension Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	(44)	(62)	(196)
Defined Benefit Plan Special Termination Benefits	0	0
Defined Benefit Plan, Actual Return on Plan Assets	321	273
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation	2,359	2,161
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets	1,770	1,591
Defined Benefit Plan, Plan Amendments	0	0
Other Comprehensive Income, Defined Benefit Plan, Net Prior Service Cost (Credit) Arising During Period, before Tax	0	0
US | Qualified Plan [Member] | Pension Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	(43)	(62)	(196)
Foreign Plan [Member] | Pension Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	1	0	$ 0
Defined Benefit Plan Special Termination Benefits	3	1
Defined Benefit Plan, Actual Return on Plan Assets	416	529
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation	338	299
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Plan Assets	35	44
Defined Benefit Plan, Plan Amendments	2	0
Other Comprehensive Income, Defined Benefit Plan, Net Prior Service Cost (Credit) Arising During Period, before Tax	$ 1	$ 0

Employee Benefits Plans (Text_2

Employee Benefits Plans (Textual 1) (Details) - Share-based Compensation Plan	12 Months Ended
	Dec. 31, 2020
Employee Stock Option [Member]
Employee Benefit Plans Additional (Textual) [Abstract]
Stock Options Terms of Award	Stock options granted under the provisions of the Plan and prior plans permit purchase of our common stock at exercise prices equivalent to the average fair market value of ConocoPhillips common stock on the date the options were granted. The options have terms of 10 years and generally vest ratably, with one-third of the options awarded vesting and becoming exercisable on each anniversary date following the date of grant. Options awarded to certain employees already eligible for retirement vest within six months of the grant date, but those options do not become exercisable until the end of the normal vesting period. Beginning in 2018, stock option grants were discontinued and replaced with three-year, time-vested restricted stock units which generally will be cash-settled
Restricted Stock Units (RSUs) [Member]
Employee Benefit Plans Additional (Textual) [Abstract]
Stock Options Terms of Award	Generally, restricted stock units are granted annually under the provisions of the Plan and vest in an aggregate installment on the third anniversary of the grant date. In addition, restricted stock units granted under the Plan for a variable long-term incentive program vest ratably in three equal annual installments beginning on the first anniversary of the grant date. Restricted stock units are also granted ad hoc to attract or retain key personnel, and the terms and conditions under which these restricted stock units vest vary by award
RSU Stock Settled [Member]
Employee Benefit Plans Additional (Textual) [Abstract]
Stock Options Terms of Award	Upon vesting, these restricted stock units are settled by issuing one share of ConocoPhillips common stock per unit. Units awarded to retirement eligible employees vest six months from the grant date; however, those units are not issued as common stock until the earlier of separation from the company or the end of the regularly scheduled vesting period. Until issued as stock, most recipients of the restricted stock units receive a cash payment of a dividend equivalent that is charged to retained earnings. Executive recipients receive an accrued reinvested dividend equivalent, subject to the terms and conditions of the award, that is charged to retained earnings. The grant date fair market value of these restricted stock units is deemed equal to the average ConocoPhillips stock price on the grant date. The grant date fair market value of units that do not receive a dividend equivalent while unvested is deemed equal to the average ConocoPhillips stock price on the grant date, less the net present value of the dividends that will not be received
RSU Cash Settled [Member]
Employee Benefit Plans Additional (Textual) [Abstract]
Stock Options Terms of Award	Cash settled executive restricted stock units granted in 2018 and 2019 replaced the stock option program. These restricted stock units, subject to elections to defer, will be settled in cash equal to the fair market value of a share of ConocoPhillips common stock per unit on the settlement date and are classified as liabilities on the balance sheet. Units awarded to retirement eligible employees vest six months from the grant date; however, those units are not settled until the earlier of separation from the company or the end of the regularly scheduled vesting period. Compensation expense is initially measured using the average fair market value of ConocoPhillips common stock and is subsequently adjusted, based on changes in the ConocoPhillips stock price through the end of each subsequent reporting period, through the settlement date. Recipients receive an accrued reinvested dividend equivalent that is charged to compensation expense. The accrued reinvested dividend is paid at the time of settlement, subject to the terms and conditions of the award. Beginning with executive restricted stock units granted in 2020 awards will be settled in stock.
PSU Stock Settled [Member]
Employee Benefit Plans Additional (Textual) [Abstract]
Stock Options Terms of Award	For performance periods beginning before 2009, PSUs do not vest until the employee becomes eligible for retirement by reaching age 55 with five years of service, and restrictions do not lapse until the employee separates from the company. With respect to awards for performance periods beginning in 2009 through 2012, PSUs do not vest until the earlier of the date the employee becomes eligible for retirement by reaching age 55 with five years of service or five years after the grant date of the award, and restrictions do not lapse until the earlier of the employee’s separation from the company or five years after the grant date (although recipients can elect to defer the lapsing of restrictions until separation). We recognize compensation expense for these awards beginning on the grant date and ending on the date the PSUs are scheduled to vest. Since these awards are authorized three years prior to the grant date, for employees eligible for retirement by or shortly after the grant date, we recognize compensation expense over the period beginning on the date of authorization and ending on the date of grant. Until issued as stock, recipients of the PSUs receive a quarterly cash payment of a dividend equivalent that is charged to retained earnings. Beginning in 2013, PSUs authorized for future grants will vest, absent employee election to defer, upon settlement following the conclusion of the three-year performance period. We recognize compensation expense over the period beginning on the date of authorization and ending on the conclusion of the performance period. PSUs are settled by issuing one share of ConocoPhillips common stock per unit.
PSU Cash Settled [Member]
Employee Benefit Plans Additional (Textual) [Abstract]
Stock Options Terms of Award	Beginning in February 2014, initial target PSU awards are issued near the beginning of new performance periods. These initial target PSU awards will terminate at the end of the performance periods and will be settled after the performance periods have ended. Also in 2014, initial target PSU awards were issued for open performance periods that began in prior years. For the open performance period beginning in 2012, the initial target PSU awards terminated at the end of the three-year performance period and were replaced with approved PSU awards. For the open performance period beginning in 2013, the initial target PSU awards terminated at the end of the three-year performance period and were settled after the performance period ended.

Income Taxes - Components of pr

Income Taxes - Components of provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Federal
Current	$ 3	$ 18	$ 4
Deferred	(625)	(113)	545
Foreign
Current	350	2,545	3,273
Deferred	(70)	(323)	(166)
State and local
Current	(4)	148	108
Deferred	(139)	(8)	(96)
Total provision (benefit) for income taxes	$ (485)	$ 2,267	$ 3,668

Income Taxes - Components of de

Income Taxes - Components of deferred tax liabilties and assets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 02, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Liabilities
Properties, plants and equipment, and intangibles	$ 7,744	$ 8,660
Inventory	64	35
Other	242	234
Total deferred tax liabilities	8,050	8,929
Deferred Tax Assets
Benefit plan accruals	540	542
Asset retirement obligations and accrued environmental costs	2,262	2,339
Investments in joint ventures (Asset)	1,653	1,722
Other financial accruals and deferrals	907	777
Loss and credit carryforwards	8,904	8,968
Other	365	345
Total deferred tax assets	14,631	14,693
Less valuation allowance	(9,965)	(10,214)		$ (3,040)	$ (1,254)
Net deferred tax assets	4,666	4,479	$ 151
Total deferred tax liabilities	$ 3,384	$ 4,450

Income Taxes - Carryforwards (D

Income Taxes - Carryforwards (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 02, 2019
Income Taxes [Abstract]
U.S. foreign tax credits	$ 7,000		$ 6,642
Total loss and credit carryforwards	$ 8,904	$ 8,968

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Deferred Tax Asset Valuation Allowance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Abstract]
Beginning balance	$ 10,214	$ 3,040	$ 1,254
Deferred Tax Asset, Valuation Allowance, Charged To Expense	460	(225)	(26)
Deferred Tax Assets, Valuation Allowance, Other	(709)	7,399	1,812
Ending balance	$ 9,965	$ 10,214	$ 3,040

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of the beginning and ending unrecognized tax benefits
Unrecognized Tax Benefits, Balance at January 1	$ 1,177	$ 1,081	$ 882
Additions based on tax positions related to the current year	6	9	268
Additions for tax positions of prior years	67	120	43
Reductions for tax positions of prior years	(34)	(22)	(73)
Settlements	(9)	(9)	(35)
Lapse of statute	(1)	(2)	(4)
Unrecognized Tax Benefits, Balance at December 31	$ 1,206	$ 1,177	$ 1,081

Income Taxes - U.S. and foreign

Income Taxes - U.S. and foreign income (loss) from continuing operations before income taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Abstract]
Income (loss) before taxes - United States	$ (3,587)	$ 4,704	$ 2,867
Income Loss Before Income Taxes Foreign	447	4,820	7,106
Income (loss) before income taxes	(3,140)	9,524	9,973
Federal statutory income tax	(659)	2,000	2,095
Non-U.S. effective tax rates	194	1,399	1,766
Tax Legislation	0	0	(10)
Australia disposition	(349)	0	0
U.K. disposition	0	(732)	(150)
Recovery of outside basis	(22)	(77)	(21)
Adjustment to tax reserves, amount	18	9	(4)
Adjustment to valuation allowances	460	(225)	(26)
State income tax	(112)	123	135
Enhanded oil recovery credit	(6)	(27)	(99)
Malaysia Deepwater TaxCredits Incentive	0	(164)	0
Other	(9)	(39)	(18)
Total provision (benefit) for income taxes	$ (485)	$ 2,267	$ 3,668
Income (loss) before income taxes, United States, Percentage	114.20%	49.40%	28.70%
Income (loss) before income taxes, foreign, percentage	(14.20%)	50.60%	71.30%
Income (Loss) Before Income Taxes In Percent	100.00%	100.00%	100.00%
Federal statutory rate percentage	21.00%	21.00%	21.00%
Tax legislation, percentage	0.00%	0.00%	(0.10%)
Canada disposition, percentage	11.10%	0.00%	0.00%
U.K. disposition, percentage	0.00%	(7.70%)	(1.50%)
Recovery of outside basis, percentage	0.70%	(0.80%)	(0.20%)
Adjustment to valuation allowances	(14.60%)	(2.40%)	(0.30%)
State income tax, percentage	3.60%	1.30%	1.40%
Enhanced oil recovery, percentage	0.20%	(0.30%)	(1.00%)
Other, percentage	0.30%	(0.40%)	(0.20%)
Adjustment to tax reserves, percentage	(0.60%)	0.10%	0.00%
Effective Income Tax Rate, Continuing Operations, percetage	15.50%	23.80%	36.80%
Malaysia Deepwater Tax Credits Incentive, Percentage	0.00%	(1.70%)	0.00%
Non US effective tax rates percentage	(6.20%)	14.70%	17.70%

Income Taxes - Textuals (Detail

Income Taxes - Textuals (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 02, 2019
Income Tax Examination [Line Items]
Deferred taxes Included in long-term liabilities	$ 3,747			$ 3,747	$ 4,634
Increase (decrease) in valuation allowance	6,642
Deferred Tax Assets Net	4,666			4,666	4,479		$ 151
U.S. foreign tax credits	7,000			7,000			$ 6,642
Undistributed Earnings of Foreign Subsidiaries	3,982			3,982
Estimated Tax Payable On Undistributed Unremitted Foreign Income				199
Unrecognized tax benefits that if recognized, would affect effective tax rate	1,128			1,128	1,100	$ 1,081
Accrued liabilities for interest and penalties	46			46	42	45
Interest and penalties (benefiting) charging earnings				(4)	3	4
Tax Legislation				0	0	(10)
Adjustment to valuation allowances				460	(225)	(26)
Income Tax Expense (Benefit)				(485)	2,267	3,668
Income Tax Loss (Benefit) related to U.K. disposition				0	(732)	(150)
Malaysia Deepwater Tax Credits Incentive				0	164	$ 0
Reversal of deferred tax assets			$ 120
Decrease to our accrued income and other taxes liability			$ 124
BPs Kuparuk Assets [Member] | ConocoPhillips [Member]
Income Tax Examination [Line Items]
Percent Sold						24.00%
Noncurrent Asset
Income Tax Examination [Line Items]
Deferred taxes Included in long-term assets	363			363	184
Noncurrent Liabilities
Income Tax Examination [Line Items]
Deferred taxes Included in long-term liabilities	3,747			3,747	4,634
Clair Field [Member]
Income Tax Examination [Line Items]
Gain (Loss) on Sale of Oil and Gas Property				1,700	$ 715
Income Tax Expense (Benefit)				(335)
Income Tax Loss (Benefit) related to U.K. disposition				285
Malaysia Deepwater Tax Credits Incentive		$ 164
Capital Loss Carryforward	2,100			2,100
Clair Field [Member] | BPs Kuparuk Assets [Member] | ConocoPhillips [Member]
Income Tax Examination [Line Items]
Percent Sold						16.50%
Certain Jurisdictions Outside Of Domestic [Member]
Income Tax Examination [Line Items]
U.S. foreign tax credits	$ 1,900			1,900
Australia-West [Member]
Income Tax Examination [Line Items]
Increase (decrease) in valuation allowance				178
Gain (Loss) on Sale of Oil and Gas Property				313
Gain on disposition				587
Income Tax Expense (Benefit)				(10)
Reversal of deferred tax assets				$ (92)

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plans, Beginning Balance	$ (350)	$ (361)	$ (400)
Other Comprehensive Income (Loss), Defined Benefit Plans	(75)	51	39
Defined Benefit Plans, Ending Balance	(425)	(350)	(361)
Net Unrealized Gain on Securities, Beginning Balance	0	0	(58)
Unrealized loss on securities, net of tax	2	0	0
Net Unrealized Gain on Securities, Ending Balance	2	0	0
Foreign Currency Translation, Beginning Balance	(5,007)	(5,702)	(5,060)
Other comprehensive income (loss), Foreign Currency Translation	212	695	(642)
Foreign Currency Translation, Ending Balance	(4,795)	(5,007)	(5,702)
Accumulated Other Comprehensive Income (loss), Beginning Balance	(5,357)	(6,063)	(5,518)
Other comprehensive income (loss), net of tax	139	746	(603)
Accumulated Other Comprehensive Income (loss), Ending Balance	$ (5,218)	(5,357)	(6,063)
ASU 2016-01 Accounting for Cenovus Shares [Member] | Restatement Adjustment [Member]
Other comprehensive income (loss), net of tax			$ 58
ASU 2018-02 [Member]
Other Comprehensive Income (Loss), Defined Benefit Plans		(40)
Other comprehensive income (loss), net of tax		$ (40)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income Textual (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other comprehensive income (loss), Foreign Currency Translation	$ 212	$ 695	$ (642)
U.K. Subsidiaries [Member]
Other comprehensive income (loss), Foreign Currency Translation		$ 483

Accumulated Other Comprehensi_5

Accumulated Other Comprehensive Income - Reclassifications out of other comprehensive income (loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive (Income) Loss Reclassification Adjustment From AOCI Pension And Other Postretirement Benefit Plans, Net Of Tax	$ 72	$ 88
Other Comprehensive (Income) Loss Reclassification Adjustment From AOCI Pension And Other Postretirement Benefit Plans, Tax	$ 13	$ 23

Cash Flow Information (Details)

Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Increase in PP&E related to increase in asset retirement obligations	$ (116)	$ 205	$ 395
Interest Paid, Net	785	810	772
Income Taxes Paid, Net	905	2,905	2,976
Payments for (Proceeds from) Short-term Investments [Abstract]
Short-term investments purchased	(12,435)	(4,902)	(1,953)
Short-term investments sold	12,015	2,138	3,573
Long-term investments purchased	(325)	(146)	0
Investments and long-term receivables sold	87	0	0
Net Sales (Purchases) of Investments	658	2,910	(1,620)
Nonmonetary Transactions [Abstract]
Accounts receivable Acquired	0	0	(44)
Inventories Acquired	0	0	42
Investments Acquired	0	0	15
PPE Acquired	0	0	1,907
Other Long Term Assets Acquired	0	0	(9)
Accounts Payable	0	0	7
Accrued income and other taxes	$ 0	$ 0	$ 40

Cash Flow Information - Parenth

Cash Flow Information - Parenthetical (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash Flow Information [Abstract]
Discretionary payment to domestic qualified pension plan.	$ 324	$ 120
ConocoPhillips Vs Petroleos de Venezuela SA [Member]
Loss Contingencies [Line Items]
Cash Proceeds from Legal Settlements	$ 330	430
Burlington Resources Inc Vs The Republic Of Ecuador [Member]
Loss Contingencies [Line Items]
Cash Proceeds from Legal Settlements		$ 262

Other Financial Information (De

Other Financial Information (Details) - USD ($)		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Production and Operating Expenses		$ 4,344,000,000	$ 5,322,000,000	$ 5,213,000,000
Foreign Currency Transaction [Abstract]
Foreign Currency Transaction Gain Loss After Tax		(62,000,000)	58,000,000	(13,000,000)
Incurred
Debt		788,000,000	799,000,000	838,000,000
Other		73,000,000	36,000,000	67,000,000
Interest Costs Incurred, Total		861,000,000	835,000,000	905,000,000
Capitalized		(55,000,000)	(57,000,000)	(170,000,000)
Expensed		806,000,000	778,000,000	735,000,000
Other Income
Interest income		100,000,000	166,000,000	97,000,000
Unrealized Gain (Loss) on Securities, before tax	[1]	(855,000,000)	649,000,000	(437,000,000)
Other, net		246,000,000	543,000,000	513,000,000
Other Nonoperating Income (Expense)		(509,000,000)	1,358,000,000	173,000,000
Research and Development Expenditures - expensed		75,000,000	82,000,000	78,000,000
Shipping and Handling [Member]
Segment Reporting Information [Line Items]
Production and Operating Expenses		857,000,000	1,008,000,000	1,075,000,000
Corporate, Non-Segment [Member]
Foreign Currency Transaction [Abstract]
Foreign Currency Transaction Gain Loss After Tax		(31,000,000)	21,000,000	21,000,000
Incurred
Expensed		806,000,000	778,000,000	735,000,000
Other Income
Interest income		88,000,000	149,000,000	80,000,000
Alaska Segment [Member] | Operating Segments [Member]
Foreign Currency Transaction [Abstract]
Foreign Currency Transaction Gain Loss After Tax		0	0	0
Other Income
Interest income		0	0	0
Lower 48 Segment [Member] | Operating Segments [Member]
Foreign Currency Transaction [Abstract]
Foreign Currency Transaction Gain Loss After Tax		0	0	0
Other Income
Interest income		0	0	0
Canada Segment [Member] | Operating Segments [Member]
Foreign Currency Transaction [Abstract]
Foreign Currency Transaction Gain Loss After Tax		(7,000,000)	5,000,000	(11,000,000)
Other Income
Interest income		0	0	0
Europe and North Africa Segment [Member] | Operating Segments [Member]
Other Income
Interest income		5,000,000	11,000,000	12,000,000
Europe, Middle East, And North Africa [Member] | Operating Segments [Member]
Foreign Currency Transaction [Abstract]
Foreign Currency Transaction Gain Loss After Tax		(15,000,000)	0	(26,000,000)
Asia Pacific and Middle East Segment [Member] | Operating Segments [Member]
Other Income
Interest income		7,000,000	6,000,000	5,000,000
Asia Pacific [Member] | Operating Segments [Member]
Foreign Currency Transaction [Abstract]
Foreign Currency Transaction Gain Loss After Tax		(11,000,000)	31,000,000	3,000,000
Other International Segment [Member] | Operating Segments [Member]
Foreign Currency Transaction [Abstract]
Foreign Currency Transaction Gain Loss After Tax		2,000,000	1,000,000	0
Other Income
Interest income		$ 0	$ 0	$ 0
[1]	*See Note 6—Investment in Cenovus Energy, for additional information.

Other Financial Information - P

Other Financial Information - Property, Plant and Equipment (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Properties, Plants And Equipment
Proved properties	$ 94,312,000,000	$ 88,284,000,000
Unproved properties	4,141,000,000	3,980,000,000
Other	3,653,000,000	5,482,000,000
Gross properties, plants and equipment	102,106,000,000	97,746,000,000
Accumulated depreciation	(62,213,000,000)	(55,477,000,000)
Property, Plant and Equipment, Net	$ 39,893,000,000	$ 42,269,000,000

Related Party Transactions (Det

Related Party Transactions (Details) - Affiliated Entity [Member] - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Operating revenues and other income		$ 79	$ 89	$ 98
Purchases		0	38	98
Operating expenses and selling, general and administrative expenses		63	65	60
Net interest (income) expense *	[1]	$ (5)	$ (13)	$ (14)
[1]	<div>*We paid interest to, or received interest from, various affiliates. See Note 6—Investments, Loans and Long-Term Receivables, for additional information on loans to affiliated companies.</div>

Sales and Other Operating Rev_3

Sales and Other Operating Revenue - Transitional Arrangements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Sales and Other Operating Revenue	$ 18,784,000,000	$ 32,567,000,000	$ 36,417,000,000
Contract with Customer, Timing of Satisfaction of Performance Obligation and Payment	We have entered into contractual arrangements where we license proprietary technology to customers related to the optimization process for operating LNG plants. The agreements typically provide for negotiated payments to be made at stated milestones. The payments are not directly related to our performance under the contract and are recorded as deferred revenue to be recognized as revenue when the customer can utilize and benefit from their right to use the license. Payments are received in installments over the construction period.
Accounting Standards Update 2014-09 [Member]
Sales and Other Operating Revenue	$ 13,662,000,000	$ 26,106,000,000	$ 28,098,000,000

Sales and Other Operating Rev_4

Sales and Other Operating Revenue - Practical Expedients (Details)	12 Months Ended
	Dec. 31, 2020
Revenue, Practical Expedient [Abstract]
Revenue, Practical Expedient, Initial Application and Transition, Nondisclosure of Transaction Price Allocation to Remaining Performance Obligation [true/false]	true
Revenue, Practical Expedient, Remaining Performance Obligation, Description	We have long-term commodity sales contracts which use prevailing market prices at the time of delivery, and under these contracts, the market-based variable consideration for each performance obligation (i.e., delivery of commodity) is allocated to each wholly unsatisfied performance obligation within the contract.

Sales and Other Operating Rev_5

Sales and Other Operating Revenue - Revenue from Contracts With Customers (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from contracts with customers	$ 18,784,000,000	$ 32,567,000,000	$ 36,417,000,000
Revenue, Performance Obligation, Description of Payment Terms	Payment is typically due within 30 days or less.
Physical gas contracts [Member]
Revenue from contracts with customers	$ 5,177,000,000	6,558,000,000	8,218,000,000
Physical gas contracts [Member] | Commodity [Member]
Revenue from contracts with customers	5,177,000,000	6,558,000,000	8,218,000,000
Crude oil product line [Member]
Revenue from contracts with customers	395,000,000	804,000,000	1,112,000,000
Natural Gas Product Line [Member]
Revenue from contracts with customers	4,339,000,000	5,313,000,000	6,734,000,000
Other Products [Member]
Revenue from contracts with customers	443,000,000	441,000,000	372,000,000
Financial Derivative Contracts [Member]
Revenue from contracts with customers	(55,000,000)	(97,000,000)	101,000,000
Lower 48 Segment [Member]
Revenue from contracts with customers	9,872,000,000	15,514,000,000	17,029,000,000
Lower 48 Segment [Member] | Physical gas contracts [Member]
Revenue from contracts with customers	3,966,000,000	4,989,000,000	6,358,000,000
Canada Segment [Member]
Revenue from contracts with customers	1,666,000,000	2,910,000,000	3,184,000,000
Canada Segment [Member] | Physical gas contracts [Member]
Revenue from contracts with customers	727,000,000	691,000,000	629,000,000
Europe and North Africa Segment [Member] | Physical gas contracts [Member]
Revenue from contracts with customers	484,000,000	878,000,000	1,231,000,000
Europe, Middle East, And North Africa [Member]
Revenue from contracts with customers	1,917,000,000	5,101,000,000	6,635,000,000
Accounting Standards Update 2014-09 [Member]
Revenue from contracts with customers	$ 13,662,000,000	$ 26,106,000,000	$ 28,098,000,000

Sales and Other Operating Rev_6

Sales and Other Operating Revenue - Receivables and Contract Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Accounts Receivable, Net	$ 1,827	$ 2,372
Revenue, Performance Obligation, Description of Payment Terms	Payment is typically due within 30 days or less.
Revenue, Performance Obligation, Description of Timing	We typically receive payment within 30 days or less (depending on the terms of the invoice) once delivery is made.
Contract with Customer, Timing of Satisfaction of Performance Obligation and Payment	We have entered into contractual arrangements where we license proprietary technology to customers related to the optimization process for operating LNG plants. The agreements typically provide for negotiated payments to be made at stated milestones. The payments are not directly related to our performance under the contract and are recorded as deferred revenue to be recognized as revenue when the customer can utilize and benefit from their right to use the license. Payments are received in installments over the construction period.
Contract with Customer, Liability [Abstract]
Contract with Customer, Liability Beginning Balance	$ 80
Contract with Customer, Liability, Cash Received	17
Contract with Customer, Liability Ending Balance	$ 97
Change in Contract with Customer, Liability [Abstract]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Explanation	We expect to recognize the contract liabilities as of December 31, 2020, as revenue during 2021 and 2022.
Current liabilities	$ 56
Noncurrent liabilities	$ 41

Segment Disclosures - Analysis

Segment Disclosures - Analysis of Results by Operating Segment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Sales and Other Operating Revenue	$ 18,784,000,000	$ 32,567,000,000	$ 36,417,000,000
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Sales and Other Operating Revenue	18,000,000	221,000,000	168,000,000
Alaska Segment [Member]
Segment Reporting Information [Line Items]
Sales and Other Operating Revenue	3,408,000,000	5,483,000,000	5,740,000,000
Alaska Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and Other Operating Revenue	3,397,000,000	5,483,000,000	5,740,000,000
Alaska Segment [Member] | Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Sales and Other Operating Revenue	(11,000,000)	0	0
Lower 48 Segment [Member]
Segment Reporting Information [Line Items]
Sales and Other Operating Revenue	9,872,000,000	15,514,000,000	17,029,000,000
Lower 48 Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and Other Operating Revenue	9,821,000,000	15,468,000,000	16,989,000,000
Lower 48 Segment [Member] | Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Sales and Other Operating Revenue	(51,000,000)	(46,000,000)	(40,000,000)
Canada Segment [Member]
Segment Reporting Information [Line Items]
Sales and Other Operating Revenue	1,666,000,000	2,910,000,000	3,184,000,000
Canada Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and Other Operating Revenue	1,261,000,000	1,769,000,000	2,024,000,000
Canada Segment [Member] | Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Sales and Other Operating Revenue	(405,000,000)	(1,141,000,000)	(1,160,000,000)
Europe and North Africa Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and Other Operating Revenue	1,919,000,000	5,101,000,000	6,635,000,000
Europe, Middle East, And North Africa [Member]
Segment Reporting Information [Line Items]
Sales and Other Operating Revenue	1,917,000,000	5,101,000,000	6,635,000,000
Europe, Middle East, And North Africa [Member] | Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Sales and Other Operating Revenue	(2,000,000)	0	0
Asia Pacific and Middle East [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and Other Operating Revenue	2,363,000,000	4,525,000,000	4,861,000,000
Other International Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Sales and Other Operating Revenue	$ 7,000,000	$ 0	$ 0

Segment Disclosures - Depreciat

Segment Disclosures - Depreciation, Equity Earnings, Income Tax (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Depreciation, Depletion, Amortization, and Impairments
DD&A and Impairments	$ 6,334,000,000	$ 6,495,000,000	$ 5,983,000,000
Equity in Earnings of Affiliates
Equity in earnings of affiliates	432,000,000	779,000,000	1,074,000,000
Income Taxes
Total provision (benefit) for income taxes	(485,000,000)	2,267,000,000	3,668,000,000
Operating Segments [Member]
Depreciation, Depletion, Amortization, and Impairments
DD&A and Impairments	6,334,000,000	6,495,000,000	5,983,000,000
Equity in Earnings of Affiliates
Equity in earnings of affiliates	432,000,000	779,000,000	1,074,000,000
Corporate, Non-Segment [Member]
Depreciation, Depletion, Amortization, and Impairments
DD&A and Impairments	54,000,000	62,000,000	106,000,000
Equity in Earnings of Affiliates
Equity in earnings of affiliates	0	0	0
Income Taxes
Total provision (benefit) for income taxes	(76,000,000)	(233,000,000)	(103,000,000)
Alaska Segment [Member] | Operating Segments [Member]
Depreciation, Depletion, Amortization, and Impairments
DD&A and Impairments	996,000,000	805,000,000	760,000,000
Equity in Earnings of Affiliates
Equity in earnings of affiliates	(7,000,000)	7,000,000	6,000,000
Income Taxes
Total provision (benefit) for income taxes	(256,000,000)	472,000,000	376,000,000
Lower 48 Segment [Member] | Operating Segments [Member]
Depreciation, Depletion, Amortization, and Impairments
DD&A and Impairments	3,358,000,000	3,224,000,000	2,370,000,000
Equity in Earnings of Affiliates
Equity in earnings of affiliates	(11,000,000)	(159,000,000)	1,000,000
Income Taxes
Total provision (benefit) for income taxes	(378,000,000)	137,000,000	474,000,000
Canada Segment [Member] | Operating Segments [Member]
Depreciation, Depletion, Amortization, and Impairments
DD&A and Impairments	342,000,000	232,000,000	324,000,000
Equity in Earnings of Affiliates
Equity in earnings of affiliates	0	0	0
Income Taxes
Total provision (benefit) for income taxes	(185,000,000)	(43,000,000)	(96,000,000)
Europe and North Africa Segment [Member] | Operating Segments [Member]
Depreciation, Depletion, Amortization, and Impairments
DD&A and Impairments	775,000,000	887,000,000	1,041,000,000
Equity in Earnings of Affiliates
Equity in earnings of affiliates	311,000,000	470,000,000	744,000,000
Income Taxes
Total provision (benefit) for income taxes	136,000,000	1,425,000,000	2,259,000,000
Asia Pacific and Middle East Segment [Member] | Operating Segments [Member]
Depreciation, Depletion, Amortization, and Impairments
DD&A and Impairments	809,000,000	1,285,000,000	1,382,000,000
Equity in Earnings of Affiliates
Equity in earnings of affiliates	137,000,000	461,000,000	323,000,000
Income Taxes
Total provision (benefit) for income taxes	294,000,000	501,000,000	728,000,000
Other International Segment [Member] | Operating Segments [Member]
Depreciation, Depletion, Amortization, and Impairments
DD&A and Impairments	0	0	0
Equity in Earnings of Affiliates
Equity in earnings of affiliates	2,000,000	0	0
Income Taxes
Total provision (benefit) for income taxes	$ (20,000,000)	$ 8,000,000	$ 30,000,000

Segment Disclosures - Net Incom

Segment Disclosures - Net Income (Loss), Investments, Total Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net Income (Loss) Attributable to ConocoPhillips
Net income (loss) attributable to ConocoPhillips	$ (2,701)	$ 7,189	$ 6,257
Investments In and Advances To Affiliates
Investments in and advances to affiliates	7,710	8,453	9,340
Total Assets
Total assets	62,618	70,514	69,980
Corporate, Non-Segment [Member]
Net Income (Loss) Attributable to ConocoPhillips
Net income (loss) attributable to ConocoPhillips	(1,880)	38	(1,667)
Investments In and Advances To Affiliates
Investments in and advances to affiliates	0	0	0
Total Assets
Total assets	8,987	11,164	8,573
Alaska Segment [Member] | Operating Segments [Member]
Net Income (Loss) Attributable to ConocoPhillips
Net income (loss) attributable to ConocoPhillips	(719)	1,520	1,814
Investments In and Advances To Affiliates
Investments in and advances to affiliates	62	83	86
Total Assets
Total assets	14,623	15,453	14,648
Lower 48 Segment [Member] | Operating Segments [Member]
Net Income (Loss) Attributable to ConocoPhillips
Net income (loss) attributable to ConocoPhillips	(1,122)	436	1,747
Investments In and Advances To Affiliates
Investments in and advances to affiliates	25	35	378
Total Assets
Total assets	11,932	14,425	14,888
Canada Segment [Member] | Operating Segments [Member]
Net Income (Loss) Attributable to ConocoPhillips
Net income (loss) attributable to ConocoPhillips	(326)	279	63
Investments In and Advances To Affiliates
Investments in and advances to affiliates	0	0	0
Total Assets
Total assets	6,863	6,350	5,748
Europe and North Africa Segment [Member] | Operating Segments [Member]
Net Income (Loss) Attributable to ConocoPhillips
Net income (loss) attributable to ConocoPhillips	448	3,170	2,594
Investments In and Advances To Affiliates
Investments in and advances to affiliates	918	1,070	1,311
Total Assets
Total assets	8,756	9,269	11,276
Asia Pacific and Middle East Segment [Member] | Operating Segments [Member]
Net Income (Loss) Attributable to ConocoPhillips
Net income (loss) attributable to ConocoPhillips	962	1,483	1,342
Investments In and Advances To Affiliates
Investments in and advances to affiliates	6,705	7,265	7,565
Total Assets
Total assets	11,231	13,568	14,758
Other International Segment [Member] | Operating Segments [Member]
Net Income (Loss) Attributable to ConocoPhillips
Net income (loss) attributable to ConocoPhillips	(64)	263	364
Investments In and Advances To Affiliates
Investments in and advances to affiliates	0	0	0
Total Assets
Total assets	$ 226	$ 285	$ 89

Segment Disclosures - Capital E

Segment Disclosures - Capital Expenditures and Interest (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Capital Expenditures and Investments
Consolidated capital expenditures and investments	$ 4,715	$ 6,636	$ 6,750
Interest Income and Expense
Interest income	100	166	97
Interest and debt expense	806	778	735
Corporate, Non-Segment [Member]
Capital Expenditures and Investments
Consolidated capital expenditures and investments	40	61	190
Interest Income and Expense
Interest income	88	149	80
Interest and debt expense	806	778	735
Alaska Segment [Member] | Operating Segments [Member]
Capital Expenditures and Investments
Consolidated capital expenditures and investments	1,038	1,513	1,298
Interest Income and Expense
Interest income	0	0	0
Lower 48 Segment [Member] | Operating Segments [Member]
Capital Expenditures and Investments
Consolidated capital expenditures and investments	1,881	3,394	3,184
Interest Income and Expense
Interest income	0	0	0
Canada Segment [Member] | Operating Segments [Member]
Capital Expenditures and Investments
Consolidated capital expenditures and investments	651	368	477
Interest Income and Expense
Interest income	0	0	0
Europe and North Africa Segment [Member] | Operating Segments [Member]
Capital Expenditures and Investments
Consolidated capital expenditures and investments	600	708	877
Interest Income and Expense
Interest income	5	11	12
Asia Pacific and Middle East Segment [Member] | Operating Segments [Member]
Capital Expenditures and Investments
Consolidated capital expenditures and investments	384	584	718
Interest Income and Expense
Interest income	7	6	5
Other International Segment [Member] | Operating Segments [Member]
Capital Expenditures and Investments
Consolidated capital expenditures and investments	121	8	6
Interest Income and Expense
Interest income	$ 0	$ 0	$ 0

Segment Disclosures - Sales by

Segment Disclosures - Sales by Product (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Sales and Other Operating Revenue	$ 18,784,000,000	$ 32,567,000,000	$ 36,417,000,000
Natural Gas [Member]
Segment Reporting Information [Line Items]
Sales and Other Operating Revenue	6,427,000,000	8,715,000,000	10,720,000,000
Natural Gas Liquids [Member]
Segment Reporting Information [Line Items]
Sales and Other Operating Revenue	528,000,000	814,000,000	1,114,000,000
Crude Oil [Member]
Segment Reporting Information [Line Items]
Sales and Other Operating Revenue	9,736,000,000	18,482,000,000	19,571,000,000
Other Products [Member]
Segment Reporting Information [Line Items]
Sales and Other Operating Revenue	$ 2,093,000,000	$ 4,556,000,000	$ 5,012,000,000

Segment Disclosures - Geographi

Segment Disclosures - Geographic Information (Details) - USD ($)		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018
Geographic Information
Revenue from contracts with customers		$ 18,784,000,000		$ 32,567,000,000	$ 36,417,000,000
Long-Lived Assets	[1]	47,603,000,000		50,722,000,000	55,038,000,000
US
Geographic Information
Revenue from contracts with customers		13,230,000,000		21,159,000,000	22,740,000,000
Long-Lived Assets	[1]	24,034,000,000	[2]	26,566,000,000	26,838,000,000
Australia and Timor-Leste
Geographic Information
Revenue from contracts with customers		605,000,000		1,647,000,000	1,798,000,000
Long-Lived Assets	[1]	6,676,000,000	[3]	7,228,000,000	9,301,000,000
Canada [Member]
Geographic Information
Revenue from contracts with customers		1,261,000,000		1,769,000,000	2,024,000,000
Long-Lived Assets	[1]	6,385,000,000		5,769,000,000	5,333,000,000
CHINA
Geographic Information
Revenue from contracts with customers		460,000,000		772,000,000	836,000,000
Long-Lived Assets	[1]	1,491,000,000		1,447,000,000	1,380,000,000
INDONESIA
Geographic Information
Revenue from contracts with customers		689,000,000		875,000,000	886,000,000
Long-Lived Assets	[1]	464,000,000		605,000,000	669,000,000
Libya
Geographic Information
Revenue from contracts with customers		155,000,000		1,103,000,000	1,142,000,000
Long-Lived Assets	[1]	670,000,000		668,000,000	679,000,000
MALAYSIA
Geographic Information
Revenue from contracts with customers		610,000,000		1,230,000,000	1,346,000,000
Long-Lived Assets	[1]	1,501,000,000		1,871,000,000	2,327,000,000
NORWAY
Geographic Information
Revenue from contracts with customers		1,426,000,000		2,349,000,000	2,886,000,000
Long-Lived Assets	[1]	5,294,000,000		5,258,000,000	5,582,000,000
UNITED KINGDOM
Geographic Information
Revenue from contracts with customers		336,000,000		1,649,000,000	2,606,000,000
Long-Lived Assets	[1]	1,000,000		2,000,000	1,583,000,000
Segment Geographical Groups of Countries Other [Member]
Geographic Information
Revenue from contracts with customers		12,000,000		14,000,000	153,000,000
Long-Lived Assets	[1]	$ 1,087,000,000		$ 1,308,000,000	$ 1,346,000,000
[1]	<div>(2)Defined as net PP&E plus equity investments and advances to affiliated companies.</div>
[2]	<div>(3)Long-lived assets do not include $426 million of net PP&E associated with assets held for sale as of December 31, 2019. See Note 5—Acquisitions and Dispositions, for additional information.</div>
[3]	<div>(4)Long-lived assets do not include $1,236 million of net PP&E associated with assets held for sale as of December 31, 2019. See Note 5—Acquisitions and Dispositions, for additional information.</div>

Segment Disclosures - Textuals

Segment Disclosures - Textuals (Textual) (Details)	12 Months Ended
	Dec. 31, 2020
Segment Disclosures and Related Information (Textual) [Abstract]
Number of operating segments	6

Acquisition of Concho Resources

Acquisition of Concho Resources Inc - Narrative Intro (Details) shares in Millions, $ in Billions	Jan. 15, 2021USD ($)shares	Oct. 18, 2020
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 13.1
Business Combination, Share Exchange Ratio	1.46
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares	286
Business Combination, Percent Of Outstanding Shares Upon Completion	21.00%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt	$ 3.9
Long-term Debt, Fair Value	$ 4.7
Settled Debt Exchange Offer, Percent Of Historical Notes	98.00%
Concho Resources Inc. [Member]
Business Acquisition [Line Items]
Business Acquisition, Date of Acquisition Agreement		Oct. 18, 2020

Acquisition of Concho Resourc_2

Acquisition of Concho Resources Inc - Fair Value Of Consideration (Details) $ / shares in Units, $ in Millions	Jan. 15, 2021USD ($)$ / sharesshares	Dec. 31, 2020shares	Dec. 31, 2019shares
Business Acquisition [Line Items]
Common Stock, Shares, Issued		1,798,844,267	1,795,652,203
Business Combination, Share Exchange Ratio	1.46
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	286,000,000
Business Combination, Consideration Transferred | $	$ 13,100
Concho Resources Inc [Member] | Subsequent Event [Member]
Business Acquisition [Line Items]
Common Stock, Shares, Issued	194,243,000
Shares Outstanding	195,842,000
Business Combination, Share Exchange Ratio	1.46
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	285,929,000
Business Acquisition, Share Price | $ / shares	$ 45.9025
Business Combination, Consideration Transferred | $	$ 13,125
Concho Resources Inc [Member] | Restricted Stock [Member] | Subsequent Event [Member]
Business Acquisition [Line Items]
Common stock shares outstanding	1,599,000